Fixes #313

Currently translated at 36.5% (321 of 880)

Fixes #341.

Currently translated at 28.0% (246 of 880)

This way we link based on the content rather than message ID which does
not have to be unique for a project.

Fixes #326

Issue #326

This will be used for linking instead of checksum (issue #326).

Currently translated at 27.7% (244 of 880)

Currently translated at 27.4% (241 of 880)

Fixes #315.

Currently translated at 21.4% (188 of 880)

Added update and upload to the blacklist

Update and upload are most of the time not translated.

Currently translated at 10.2% (90 of 880)