Normalize translation key for user prefrerences

preferences normalized:
 - annotations
 - annotations_subscribed
 - automatic_instance_redirect
 - autoplay
 - captions
 - comments
 - continue
 - continue_autoplay
 - dark_mode
 - default_home
 - extend_desc
 - feed_menu
 - listen
 - local
 - locale
 - max_results
 - notifications_only
 - player_style
 - quality
 - quality_dash
 - related_videos
 - show_nick
 - sort
 - speed
 - thin_mode
 - unseen_only
 - video_loop
 - volume
 - vr_mode

locales/zh-CN.json

@@ -61,38 +61,38 @@
     "Google verification code": "Google 验证代码",
     "Preferences": "偏好设置",
     "Player preferences": "播放器偏好设置",
-    "Always loop: ": "始终循环： ",
-    "Autoplay: ": "自动播放: ",
-    "Play next by default: ": "默认自动播放下一个视频: ",
-    "Autoplay next video: ": "自动播放下一个视频: ",
-    "Listen by default: ": "默认只听声音: ",
-    "Proxy videos: ": "是否代理视频: ",
-    "Default speed: ": "默认速度: ",
-    "Preferred video quality: ": "视频质量偏好: ",
-    "Player volume: ": "播放器音量: ",
-    "Default comments: ": "默认评论源: ",
+    "preferences_video_loop_label": "始终循环： ",
+    "preferences_autoplay_label": "自动播放: ",
+    "preferences_continue_label": "默认自动播放下一个视频: ",
+    "preferences_continue_autoplay_label": "自动播放下一个视频: ",
+    "preferences_listen_label": "默认只听声音: ",
+    "preferences_local_label": "是否代理视频: ",
+    "preferences_speed_label": "默认速度: ",
+    "preferences_quality_label": "视频质量偏好: ",
+    "preferences_volume_label": "播放器音量: ",
+    "preferences_comments_label": "默认评论源: ",
     "youtube": "YouTube",
     "reddit": "Reddit",
-    "Default captions: ": "默认字幕语言: ",
+    "preferences_captions_label": "默认字幕语言: ",
     "Fallback captions: ": "后备字幕语言: ",
-    "Show related videos: ": "是否显示相关视频: ",
-    "Show annotations by default: ": "是否默认显示视频注释: ",
-    "Automatically extend video description: ": "自动展开视频描述： ",
-    "Interactive 360 degree videos: ": "互动式 360 度视频： ",
+    "preferences_related_videos_label": "是否显示相关视频: ",
+    "preferences_annotations_label": "是否默认显示视频注释: ",
+    "preferences_extend_desc_label": "自动展开视频描述： ",
+    "preferences_vr_mode_label": "互动式 360 度视频： ",
     "Visual preferences": "视觉选项",
-    "Player style: ": "播放器样式: ",
+    "preferences_player_style_label": "播放器样式: ",
     "Dark mode: ": "深色模式: ",
-    "Theme: ": "主题: ",
+    "preferences_dark_mode_label": "主题: ",
     "dark": "暗色",
     "light": "亮色",
-    "Thin mode: ": "窄页模式: ",
+    "preferences_thin_mode_label": "窄页模式: ",
     "Miscellaneous preferences": "其他选项",
-    "Automaticatic instance redirection (fallback to redirect.invidious.io): ": "自动实例重定向 (回退到redirect.invidious.io): ",
+    "preferences_automatic_instance_redirect_label": "自动实例重定向 (回退到redirect.invidious.io): ",
     "Subscription preferences": "订阅设置",
-    "Show annotations by default for subscribed channels: ": "默认情况下显示已订阅频道的注释: ",
+    "preferences_annotations_subscribed_label": "默认情况下显示已订阅频道的注释: ",
     "Redirect homepage to feed: ": "跳转主页到 feed: ",
-    "Number of videos shown in feed: ": "Feed 中显示的视频数量: ",
-    "Sort videos by: ": "视频排序方式: ",
+    "preferences_max_results_label": "Feed 中显示的视频数量: ",
+    "preferences_sort_label": "视频排序方式: ",
     "published": "发布时间",
     "published - reverse": "发布时间（反向）",
     "alphabetically": "字母序",
@@ -101,8 +101,8 @@
     "channel name - reverse": "频道名称（反向）",
     "Only show latest video from channel: ": "只显示频道的最新视频: ",
     "Only show latest unwatched video from channel: ": "只显示频道的最新未看过视频: ",
-    "Only show unwatched: ": "只显示未看过的视频: ",
-    "Only show notifications (if there are any): ": "只显示通知 (如果有的话): ",
+    "preferences_unseen_only_label": "只显示未看过的视频: ",
+    "preferences_notifications_only_label": "只显示通知 (如果有的话): ",
     "Enable web notifications": "启用浏览器通知",
     "`x` uploaded a video": "`x` 上传了视频",
     "`x` is live": "`x` 正在直播",
@@ -115,9 +115,9 @@
     "Watch history": "观看历史",
     "Delete account": "删除账户",
     "Administrator preferences": "管理员选项",
-    "Default homepage: ": "默认主页: ",
-    "Feed menu: ": "Feed 菜单: ",
-    "Show nickname on top: ": "在顶部显示昵称： ",
+    "preferences_default_home_label": "默认主页: ",
+    "preferences_feed_menu_label": "Feed 菜单: ",
+    "preferences_show_nick_label": "在顶部显示昵称： ",
     "Top enabled: ": "是否启用“热门视频”页: ",
     "CAPTCHA enabled: ": "是否启用验证码: ",
     "Login enabled: ": "是否启用登录: ",
@@ -374,7 +374,7 @@
     "Top": "热门视频",
     "About": "关于",
     "Rating: ": "评分: ",
-    "Language: ": "语言: ",
+    "preferences_locale_label": "语言: ",
     "View as playlist": "作为播放列表查看",
     "Default": "默认",
     "Music": "音乐",