fix(search): Make new scope

because of conflict with global flags
fix(icons): refactor glyphicons
feat(locking): add UI for content item locking
fix(styling): change some general styles
fix(styling): Change way of displaying avatars

+ remove sd-user-picture directive
+ change sd-user-avatar directive
+ update all parts of UI where avatar is displayed
+ update notifications UI

fix(comments): Change display name