GUI translation
It's very easy to translate the GUI using poEdit.
To install it in Ubuntu:
sudo apt-get install poedit
To install it in Windows, download the installer and launch it.
To create a translation file, download gimx.pot.
Start poEdit, and click on "File > New Catalog from POT File...".
Select gimx.pot, fill the fields (don't edit the other tabs), validate, and save the .po file (name it <language_code>.po).
To see what your language code is, check this page.
Example for the French language: fr.po.
Translate the messages that are not translated, and save.
To test the translation in Linux, execute the following commands:
mkdir -p /usr/share/locale/<language_code>/LC_MESSAGES msgfmt -o /usr/share/locale/<language_code>/LC_MESSAGES/gimx.mo <language_code>.po
To test the translation in Windows, generate gimx.mo with poEdit, and put it in the GIMX installation directory, in a share/locale/<language_code>/LC_MESSAGES directory.
Start gimx-serial, gimx-bluetooth, gimx-fpsconfig or gimx-config, the GUI should be translated.