about dialog: fix version
Add user completion

This just Keeps track of all the other users the user has 'seen',
i.e. has some kind of interaction with(visited his profile, had a
DM conversation with him, etc.). This sucks because the completion
won't be working perfectly from the very beginning. Also, the completion
UI currently sucks.
DMThreadsPage: Don't crash if twitter calls fail

This can e.g. easily happen if the user does not have an internet
connection.
tweet-info-page.ui: Make placeholder string untranslatable
Merge branch 'master'
DMThreadsPage: Mark the user of a new conversation as seen
Remove some legacy code
DMPage: Fix order of direct messages
DMs: fix dm retrieval when cached messages are not laoded yet