[web] Fix playlist page displaying one ghost entry when no playlist are present

When there are no playlists or all of them are filtered out, the list of playlists is now completely empty.

web-src/src/locales/de.json

@@ -380,6 +380,7 @@
       "track-count": "{count} Track|{count} Tracks"
     },
     "playlists": {
+      "title": "Playlisten",
       "count": "{count} Playlist|{count} Playlisten"
     },
     "podcast": {

web-src/src/locales/en.json

@@ -380,6 +380,7 @@
       "track-count": "{count} track|{count} track|{count} tracks"
     },
     "playlists": {
+      "title": "Playlists",
       "count": "{count} playlist|{count} playlist|{count} playlists"
     },
     "podcast": {

web-src/src/locales/fr.json

@@ -380,6 +380,7 @@
       "track-count": "{count} piste|{count} piste|{count} pistes"
     },
     "playlists": {
+      "title": "Listes de lecture",
       "count": "{count} liste de lecture|{count} liste de lecture|{count} listes de lecture"
     },
     "podcast": {

web-src/src/locales/zh.json

@@ -380,6 +380,7 @@
       "track-count": "{count} 只曲目|{count} 只曲目"
     },
     "playlists": {
+      "title": "播放列表",
       "count": "{count} 个播放列表|{count} 个播放列表"
     },
     "podcast": {