feat: Show hour unit on image proxy storage lifetime field

public/locales/en-US/translation.json

@@ -360,7 +360,9 @@
                     },
                     "imageProxyStorageLifeTimeInHours": {
                         "label": "Image proxy storage lifetime",
-                        "description": "The lifetime of images that are stored on the server. After this time, the image will be deleted."
+                        "description": "The lifetime of images that are stored on the server in hours. After this time, the image will be deleted.",
+                        "unit_one": "hour",
+                        "unit_other": "hours"
                     },
                     "enableImageProxy": {
                         "label": "Enable image proxy",

src/route-widgets/GlobalSettingsRoute/SettingsForm.tsx

@@ -355,6 +355,18 @@ export default function SettingsForm({settings, queryKey}: SettingsFormProps) {
 											<BsImage />
 										</InputAdornment>
 									),
+									endAdornment: (
+										<InputAdornment position="end">
+											{t(
+												"routes.AdminRoute.forms.settings.imageProxyStorageLifeTimeInHours.unit",
+												{
+													count:
+														formik.values
+															.imageProxyStorageLifeTimeInHours || 0,
+												},
+											)}
+										</InputAdornment>
+									),
 								}}
 							/>
 						</Grid>