Port to Qt translations?

[jonas]

Currently we use gettext for translations, which are converted to Qt translations on build.
I think it might be simpler to just use Qt translations (.ts) files in the source which are converted to .qm files on build, Crowdin also supports Qt .ts files.

Some advantages:

• Simplifies CMake files.
• We can use automoc.
• No longer need gettext utilities.

Are there any disadvantages?