Various minor bug fixes (#1707)

## Description
Gathering several small bug fixes:
- Clear the backdrop when manually reloading the home page
- Convert the "# years old" string resource to plural
- Fix a spelling error in the source English strings
- Ensure #1680 is respected when searching for subtitles to download
- Slightly adjust padding for the header in collection details to match
other headers

### Related issues
Fixes string issues reported in
https://github.com/damontecres/Wholphin/issues/1705#issuecomment-4982909931

### Testing
Emulator

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/res/values-fr/strings.xml

@@ -178,7 +178,9 @@
     <string name="tv_guide">Guide</string>
     <string name="ui_interface">Interface</string>
     <string name="video_scale">Échelle de la vidéo</string>
-    <string name="years_old">%1$d ans</string>
+    <plurals name="years_old">
+        <item quantity="other">%1$d ans</item>
+    </plurals>
     <string name="italic_font">Mettre la police en italique</string>
     <string name="official_rating">Classification parentale</string>
     <string name="extras_title">Bonus</string>