Tag synonym functionality

Suggestion: Add tag synonym functionality that treats certain tags in the same way.

Motivation: When tagging a bookmark you are unlikely to remember how you tagged similar websites. This will result in search results not fully representing your relevant bookmarks and a bloated list of tags.

Example: Website A is tagged with "coding, java" while website B is tagged with "programming, java" despite having the same type of content. The tags "coding" and "java" should be treated the same way when saving and searching your bookmarks. The synonyms groups should be user defined.