diff --git a/app/src/main/java/com/sadellie/unitto/screens/common/UnittoButton.kt b/app/src/main/java/com/sadellie/unitto/screens/common/UnittoButton.kt
new file mode 100644
index 00000000..f95a624a
--- /dev/null
+++ b/app/src/main/java/com/sadellie/unitto/screens/common/UnittoButton.kt
@@ -0,0 +1,86 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.screens.common
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.RowScope
+import androidx.compose.foundation.layout.defaultMinSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.ripple.rememberRipple
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.LocalContentColor
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ProvideTextStyle
+import androidx.compose.material3.Surface
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.Shape
+import androidx.compose.ui.semantics.Role
+
+@Composable
+fun UnittoButton(
+    onClick: () -> Unit,
+    onLongClick: (() -> Unit)?,
+    modifier: Modifier = Modifier,
+    shape: Shape,
+    containerColor: Color,
+    contentColor: Color,
+    border: BorderStroke? = null,
+    contentPadding: PaddingValues = ButtonDefaults.ContentPadding,
+    interactionSource: MutableInteractionSource,
+    content: @Composable RowScope.() -> Unit
+) {
+    Surface(
+        modifier = modifier.clip(shape).combinedClickable(
+            onClick = onClick,
+            onLongClick = onLongClick,
+            interactionSource = interactionSource,
+            indication = rememberRipple(),
+            role = Role.Button,
+        ),
+        color = containerColor,
+        contentColor = contentColor,
+        border = border
+    ) {
+        CompositionLocalProvider(LocalContentColor provides contentColor) {
+            ProvideTextStyle(value = MaterialTheme.typography.labelLarge) {
+                Row(
+                    Modifier
+                        .defaultMinSize(
+                            minWidth = ButtonDefaults.MinWidth,
+                            minHeight = ButtonDefaults.MinHeight
+                        )
+                        .padding(contentPadding),
+                    horizontalArrangement = Arrangement.Center,
+                    verticalAlignment = Alignment.CenterVertically,
+                    content = content
+                )
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/com/sadellie/unitto/screens/main/MainViewModel.kt b/app/src/main/java/com/sadellie/unitto/screens/main/MainViewModel.kt
index 6533d726..c65c909c 100644
--- a/app/src/main/java/com/sadellie/unitto/screens/main/MainViewModel.kt
+++ b/app/src/main/java/com/sadellie/unitto/screens/main/MainViewModel.kt
@@ -47,6 +47,7 @@ import com.sadellie.unitto.data.OPERATORS
 import com.sadellie.unitto.data.combine
 import com.sadellie.unitto.data.preferences.UserPreferences
 import com.sadellie.unitto.data.preferences.UserPreferencesRepository
+import com.sadellie.unitto.data.setMinimumRequiredScale
 import com.sadellie.unitto.data.toStringWith
 import com.sadellie.unitto.data.trimZeros
 import com.sadellie.unitto.data.units.AbstractUnit
@@ -59,6 +60,8 @@ import com.sadellie.unitto.data.units.database.MyBasedUnitsRepository
 import com.sadellie.unitto.data.units.remote.CurrencyApi
 import com.sadellie.unitto.data.units.remote.CurrencyUnitResponse
 import dagger.hilt.android.lifecycle.HiltViewModel
+import java.math.BigDecimal
+import javax.inject.Inject
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -73,9 +76,6 @@ import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
-import java.math.BigDecimal
-import java.math.RoundingMode
-import javax.inject.Inject
 
 @HiltViewModel
 class MainViewModel @Inject constructor(
@@ -391,107 +391,84 @@ class MainViewModel @Inject constructor(
     }
 
     private suspend fun convertInput() {
-        if (_unitFrom.value?.group == UnitGroup.NUMBER_BASE) {
-            convertAsNumberBase()
-        } else {
-            convertAsExpression()
-        }
-    }
-
-    private suspend fun convertAsNumberBase() {
+        // Loading don't do anything
+        if ((_unitFrom.value == null) or (_unitTo.value == null)) return
         withContext(Dispatchers.Default) {
             while (isActive) {
-                // Units are still loading, don't convert anything yet
-                val unitFrom = _unitFrom.value ?: return@withContext
-                val unitTo = _unitTo.value ?: return@withContext
-
-                val conversionResult = try {
-                    (unitFrom as NumberBaseUnit).convertToBase(
-                        input = _input.value,
-                        toBase = (unitTo as NumberBaseUnit).base
-                    )
-                } catch (e: Exception) {
-                    when (e) {
-                        is ClassCastException -> {
-                            cancel()
-                            return@withContext
-                        }
-                        is NumberFormatException, is IllegalArgumentException -> ""
-                        else -> throw e
-                    }
+                when (_unitFrom.value?.group) {
+                    UnitGroup.NUMBER_BASE -> convertAsNumberBase()
+                    else -> convertAsExpression()
                 }
-                _result.update { conversionResult }
                 cancel()
             }
         }
     }
 
-    private suspend fun convertAsExpression() {
-        withContext(Dispatchers.Default) {
-            while (isActive) {
-                // Units are still loading, don't convert anything yet
-                val unitFrom = _unitFrom.value ?: return@withContext
-                val unitTo = _unitTo.value ?: return@withContext
-
-                // First we clean the input from garbage at the end
-                var cleanInput = _input.value.dropLastWhile { !it.isDigit() }
-
-                // Now we close open brackets that user didn't close
-                // AUTOCLOSE ALL BRACKETS
-                val leftBrackets = _input.value.count { it.toString() == KEY_LEFT_BRACKET }
-                val rightBrackets = _input.value.count { it.toString() == KEY_RIGHT_BRACKET }
-                val neededBrackets = leftBrackets - rightBrackets
-                if (neededBrackets > 0) cleanInput += KEY_RIGHT_BRACKET.repeat(neededBrackets)
-
-                // Now we evaluate expression in input
-                val evaluationResult: BigDecimal = try {
-                    Expressions().eval(cleanInput)
-                        .setScale(_userPrefs.value.digitsPrecision, RoundingMode.HALF_EVEN)
-                        .trimZeros()
-                } catch (e: Exception) {
-                    when (e) {
-                        is ExpressionException,
-                        is ArrayIndexOutOfBoundsException,
-                        is IndexOutOfBoundsException,
-                        is NumberFormatException,
-                        is ArithmeticException -> {
-                            // Invalid expression, can't do anything further
-                            cancel()
-                            return@withContext
-                        }
-                        else -> throw e
-                    }
-                }
-
-                // Evaluated. Hide calculated result if no expression entered.
-                // 123.456 will be true
-                // -123.456 will be true
-                // -123.456-123 will be false (first minus gets removed, ending with 123.456)
-                if (_input.value.removePrefix(KEY_MINUS).all { it.toString() !in OPERATORS }) {
-                    // No operators
-                    _calculated.update { null }
-                } else {
-                    _calculated.update {
-                        evaluationResult.toStringWith(
-                            _userPrefs.value.outputFormat
-                        )
-                    }
-                }
-
-                // Now we just convert.
-                // We can use evaluation result here, input is valid
-                val conversionResult: BigDecimal = unitFrom.convert(
-                    unitTo,
-                    evaluationResult,
-                    _userPrefs.value.digitsPrecision
-                )
-
-                // Converted
-                _result.update { conversionResult.toStringWith(_userPrefs.value.outputFormat) }
-
-                cancel()
+    private fun convertAsNumberBase() {
+        val conversionResult: String = try {
+            (_unitFrom.value as NumberBaseUnit).convertToBase(
+                input = _input.value,
+                toBase = (_unitTo.value as NumberBaseUnit).base
+            )
+        } catch (e: Exception) {
+            when (e) {
+                is ClassCastException -> return
+                is NumberFormatException, is IllegalArgumentException -> ""
+                else -> throw e
             }
         }
+        _result.update { conversionResult }
+    }
+
+    private fun convertAsExpression() {
+        // First we clean the input from garbage at the end
+        var cleanInput = _input.value.dropLastWhile { !it.isDigit() }
+
+        // Now we close open brackets that user didn't close
+        // AUTO-CLOSE ALL BRACKETS
+        val leftBrackets = _input.value.count { it.toString() == KEY_LEFT_BRACKET }
+        val rightBrackets = _input.value.count { it.toString() == KEY_RIGHT_BRACKET }
+        val neededBrackets = leftBrackets - rightBrackets
+        if (neededBrackets > 0) cleanInput += KEY_RIGHT_BRACKET.repeat(neededBrackets)
+
+        // Now we evaluate expression in input
+        val evaluationResult: BigDecimal = try {
+            Expressions().eval(cleanInput)
+        } catch (e: Exception) {
+            when (e) {
+                is ArrayIndexOutOfBoundsException,
+                is IndexOutOfBoundsException,
+                is NumberFormatException,
+                is ExpressionException,
+                is ArithmeticException -> return
+                else -> throw e
+            }
+        }
+
+        // Now we just convert.
+        // We can use evaluation result here, input is valid
+        val conversionResult: BigDecimal = _unitFrom.value!!.convert(
+            _unitTo.value!!,
+            evaluationResult,
+            _userPrefs.value.digitsPrecision
+        )
+
+        // Evaluated. Hide calculated result if no expression entered.
+        // 123.456 will be true
+        // -123.456 will be true
+        // -123.456-123 will be false (first minus gets removed, ending with 123.456)
+        _calculated.update {
+            if (_input.value.removePrefix(KEY_MINUS).all { it.toString() !in OPERATORS }) {
+                null
+            } else {
+                evaluationResult
+                    .setMinimumRequiredScale(_userPrefs.value.digitsPrecision)
+                    .trimZeros()
+                    .toStringWith(_userPrefs.value.outputFormat)
+            }
+        }
+
+        _result.update { conversionResult.toStringWith(_userPrefs.value.outputFormat) }
     }
 
     private fun setInputSymbols(symbol: String, add: Boolean = true) {
diff --git a/app/src/main/java/com/sadellie/unitto/screens/main/components/KeyboardButton.kt b/app/src/main/java/com/sadellie/unitto/screens/main/components/KeyboardButton.kt
index b63a2b08..5f19f3fb 100644
--- a/app/src/main/java/com/sadellie/unitto/screens/main/components/KeyboardButton.kt
+++ b/app/src/main/java/com/sadellie/unitto/screens/main/components/KeyboardButton.kt
@@ -26,7 +26,6 @@ import androidx.compose.foundation.interaction.collectIsPressedAsState
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Button
-import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
@@ -34,6 +33,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
+import com.sadellie.unitto.screens.common.UnittoButton
 import com.sadellie.unitto.ui.theme.NumbersTextStyleTitleLarge
 
 /**
@@ -51,7 +51,7 @@ fun KeyboardButton(
     modifier: Modifier = Modifier,
     digit: String,
     isPrimary: Boolean = true,
-    onLongClick: () -> Unit = {},
+    onLongClick: (() -> Unit)? = null,
     onClick: (String) -> Unit = {}
 ) {
     val interactionSource = remember { MutableInteractionSource() }
@@ -59,24 +59,22 @@ fun KeyboardButton(
     val cornerRadius: Int by animateIntAsState(
         targetValue = if (isPressed) 30 else 50,
         animationSpec = tween(easing = FastOutSlowInEasing),
-        finishedListener = { if (it == 30) onLongClick() })
+    )
 
-    Button(
-        modifier = modifier,
-        interactionSource = interactionSource,
-        shape = RoundedCornerShape(cornerRadius),
-        colors = ButtonDefaults.buttonColors(
-            containerColor = if (isPrimary) MaterialTheme.colorScheme.inverseOnSurface else MaterialTheme.colorScheme.primaryContainer,
-            contentColor = MaterialTheme.colorScheme.onSecondaryContainer,
-            disabledContentColor = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.3f)
-        ),
+    UnittoButton(
         onClick = { onClick(digit) },
-        contentPadding = PaddingValues(0.dp)
+        onLongClick = onLongClick,
+        modifier = modifier,
+        shape = RoundedCornerShape(cornerRadius),
+        containerColor = if (isPrimary) MaterialTheme.colorScheme.inverseOnSurface else MaterialTheme.colorScheme.primaryContainer,
+        contentColor = MaterialTheme.colorScheme.onSecondaryContainer,
+        contentPadding = PaddingValues(0.dp),
+        interactionSource = interactionSource,
     ) {
         Text(
             text = digit,
             style = NumbersTextStyleTitleLarge,
-            color = if (isPrimary) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSecondaryContainer,
+            color = if (isPrimary) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSecondaryContainer
         )
     }
 }
diff --git a/app/src/main/java/com/sadellie/unitto/screens/setttings/AboutScreen.kt b/app/src/main/java/com/sadellie/unitto/screens/setttings/AboutScreen.kt
index decc9358..924b9363 100644
--- a/app/src/main/java/com/sadellie/unitto/screens/setttings/AboutScreen.kt
+++ b/app/src/main/java/com/sadellie/unitto/screens/setttings/AboutScreen.kt
@@ -59,7 +59,7 @@ fun AboutScreen(
     }
 
     UnittoLargeTopAppBar(
-        title = "About Unitto",
+        title = stringResource(R.string.about_unitto),
         navigateUpAction = navigateUpAction
     ) { padding ->
         LazyColumn(contentPadding = padding) {
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index c77d4a34..6c1f96e7 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -661,7 +661,6 @@
     <string name="separator_setting">Séparateur</string>
     <string name="output_format_setting">Format de sortie</string>
     <string name="unit_groups_setting">Groupes d\'unités</string>
-    <string name="currency_rates_note_setting">Wrong currency rates?</string>
     <string name="currency_rates_note_title">Note</string>
     <string name="currency_rates_note_text">Les taux de change sont mis à jour quotidiennement. L\'application ne permet pas de suivre le marché en temps réel.</string>
     <string name="terms_and_conditions">Termes et conditions</string>
@@ -681,20 +680,10 @@
     <string name="period">Période (42.069,12)</string>
     <string name="comma">Virgule (42,069.12)</string>
     <string name="spaces">Espaces (42 069.12)</string>
-
-    <!-- Output format -->
-    <string name="output_format_setting_support">Result value formatting</string>
-    <string name="output_format_setting_info">Engineering strings look like 1E-21</string>
     <string name="plain">Défaut</string>
-    <string name="allow_engineering">Allow engineering</string>
-    <string name="force_engineering">Force engineering</string>
-
-    <!-- Theme -->
-    <string name="theme_setting_support">App look and feel</string>
     <string name="force_auto_mode">Auto</string>
     <string name="force_light_mode">Clair</string>
     <string name="force_dark_mode">Sombre</string>
-    <string name="color_theme">Color theme</string>
     <string name="force_amoled_mode">AMOLED Noir</string>
     <string name="force_amoled_mode_support">Utiliser un fond noir pour les thèmes sombres</string>
     <string name="enable_dynamic_colors">Couleurs dynamiques</string>
@@ -703,7 +692,6 @@
     <!-- MISC. -->
     <string name="loading_label">Chargement…</string>
     <string name="error_label">Erreur</string>
-    <string name="copied">Copied %1$s!</string>
     <string name="cancel_label">Annuler</string>
     <string name="search_bar_placeholder">Rechercher des unités</string>
     <string name="search_placeholder">Aucun résultat trouvé</string>