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-zh-rTW/strings.xml

@@ -203,7 +203,9 @@
     <string name="tv_dvr_schedule">錄影排程</string>
     <string name="tv_shows_title">電視劇</string>
     <string name="ui_interface">介面</string>
-    <string name="years_old">%1$d 歲</string>
+    <plurals name="years_old">
+        <item quantity="other">%1$d 歲</item>
+    </plurals>
     <string name="play_with_transcoding">轉碼播放</string>
     <string name="one_click_pause_summary_on">按下方向鍵中央以暫停/播放</string>
     <plurals name="deleted_scenes">