Bookmark folders

Changes

• Display bookmarks from specified folders
• Create, update, delete bookmark folders
• Allow setting folder for a bookmark

Implements pleroma!4080 (merged), fixes #1335 (closed).

src/components/bookmark_folder_card/bookmark_folder_card.js

@@ -9,11 +9,12 @@ library.add(
 
 const BookmarkFolderCard = {
   props: [
-    'folder'
+    'folder',
+    'allBookmarks'
   ],
   computed: {
     firstLetter () {
-      return this.folder.name[0]
+      return this.folder ? this.folder.name[0] : null
     }
   }
 }