Translate messages for version 3.0

[dagargo]

@snd1, @trebmuh and @xfgusta, Elektroid 3.0 is ready so I'm asking for your collaborations in case you're interested.

This version, along with audio recording and the most basic audio edition, brings an auto sampler. Most of the translations are related to these functionalities.

TIA.

[trebmuh]

Done in #115 Have a nice release time @dagargo

[dagargo]

French translations merged.

Thanks for contributing, @trebmuh.

[snd1]

Done in #116 :-)

[dagargo]

German translations merged.

Danke schön, @snd1!

[dagargo]

@xfgusta, excuse me for asking but I'd like to release version 3.0 during the following couple of weeks.

Do you think you could do this? If not, I can make the release anyway and we can delay this issue for version 3.1.

[dagargo]

I'm keeping this open but I'm proceeding with the release.

[trebmuh]

Hi @dagargo : strange thing I've just noticed here : neither snd1 or myself are credited as "contributors" while fominok is. Just curious.

[dagargo]

The automatic release notes suggestion included only 3 lines, so I preferred to remove those references and add manually the most interesting things.

These did not include all the contributors to this release and perhaps those are just the accepted PRs. Bu I thought those were just the last commits and deleted them causing you to disappear. My bad.

For reference, these are the automatic release notes.

## What's Changed
* Update French translation for 3.0 by @trebmuh in https://github.com/dagargo/elektroid/pull/115
* Update de.po by @snd1 in https://github.com/dagargo/elektroid/pull/116
* Update fr.po by @fominok in https://github.com/dagargo/elektroid/pull/118

## New Contributors
* @fominok made their first contribution in https://github.com/dagargo/elektroid/pull/118

**Full Changelog**: https://github.com/dagargo/elektroid/compare/2.5.2...3.0

I've added a couple of sections and looks better now but I'm not sure if that is the best way to proceed. Maybe I did something different in the past. Can't tell.

Sorry for the inconvenience.

Let me know your suggestions and if it's better now.

[trebmuh]

Thanks for the full explanation. And for tweaking things too. Please note that my remark was there mainly because I found it curious and that it could mean there was a problem somewhere (I don't know how github and its automatic stuff works). I don't know what's the best way to do it and I trust you on that! See you next time for the next translation.

[dagargo]

Better to close this and create a new issue when no more translations are needed for version 3.1.