User preferences page always titled "My preferences"

The User preferences page, reachable when editing a perosn, is always titled "My preferences". It should only be titled "My peferences" when a user edits their own preferences.

added part::frontend type::bug labels

assigned to @hansegucker

created merge request !819 (merged) to address this issue

mentioned in merge request !819 (merged)

closed with merge request !819 (merged)

mentioned in commit 72fd701c