Revert "Merge pull request #2284 from jaimeiniesta/patch-1"

This reverts commit a6b88d1e7e3fdb41e425d1a285dc7a73788d491b, reversing
changes made to 9bee0b6e2d60e61df136b81261110cc7dcccc52c.
Add filters to colors ui
Update translations
Version bump to v0.9.9.3
Update onebox gem - don't show github.com twice in succession
move custom fields into its own concern
Add CustomFields to Post, Category and Group
fix double save missing error by using copy not actual reference
Add Custom Fields on Topics
Add Support for Arrays to CustomFields