Merge branch 'release/v0.2.0'
Merge branch 'release/v0.3.0'
Merge branch 'release/v0.4.0'
Fix README.md
Merge branch 'develop'
Merge branch 'develop'
Linux packaging

Add desktop file and change qmake projects for Linux packaging
Add Czech translation for v0.4.0

Credits to Pavel Fric
Increase version to v0.4.1
Update German and Czech translations
Add info about new version to README
Merge branch 'hotfix/v0.4.1' into develop