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Currently translated at 82.9% (34 of 41 strings)

Currently translated at 100.0% (34 of 34 strings)

Currently translated at 100.0% (33 of 33 strings)

I replaced the source strings (and parts of the translations) to not
vanish the translations.

See #172.

This will need a new dependency: `qtquickcontrols2-5-dev`
(for non-sailfish builds)

Currently translated at 31.2% (10 of 32 strings)

Clean up all includes and don't use "Swiften/Swiften.h" anymore.
This will speed up builds much.

Closes #69.

Needed because of: 8dfc75bb

Currently translated at 54.5% (6 of 11 strings)

You'll be able to translate it on weblate:
https://hosted.weblate.org/projects/kaidan/translations/
It is also a test if it really works. This commit also adds an example ts file,
if you want to add a new language, just copy it and do `make`, to update it.
I renamed the German ts file to only `de.ts` instead of `de_DE.ts`, because at
the moment we only have one translation for all German countries.