Merge pull request #1954 from Arsyadi/master

Updated Indonesian translation
Updated changelog
Updated contributing section
Warning for file not found exception
Updated requirements (debug info)
Updated changelog
Showing message when expanding category
3.1.1 stable
Updated French translation

Translated ```msg_method_expert``` and ```msg_method_expert```.
Made ```settings_parameters``` easier to understand (I hope)..
Merge pull request #1956 from tonymanou/patch-1

Updated French translation
Updated changelog