As you know, we are currently working hard on the upcoming Qt-based G'MIC plug-in for GIMP, and as this is a completely from-scratch project, we need help for translating the different labels appearing in the user interface.
I can say it should be quite straightforward and easy to help, as we use the Qt facilities for translation, and thus we just have to provide a .xml file with the original/translated strings.
We have already written this XML file for the French language : http://gmic.eu/fr.ts
And of course, we would be really interested to get the same kind of file for other languages !
I estimate the translation time to be less than 20 minutes. The file can be encoded in UTF-8.
Please tell us if you need help or additional information, and thanks by advance for your help !
A note about the word 'Decr.' found in the strings to translate (related to the Input mode parameter). It is intended to mean 'Decreasing' and means the input layers will be considered in the reverse order.
Languages already done: