If you'd like to volunteer for translating the user interface of Expresii into your language, please download this .po translation file (Japanese, acting as a sample) and this .htm Hotkey list file (English), edit them and send us back.
We'll give you a free license for Expresii for compensation. ╭( ･ㅂ･)و ̑̑
The .po file is just a plan text file that you can edit with any text editor, but you probably want to use one of the dedicated .PO editors like POEdit so that you can generate a .mo file (in POedit, just press the Save icon and both .po and .mo files are saved) to test out your text. You do so by replacing the 'default.mo' file in say the Japanese translation folders of Expresii, which looks like this: C:\Program Files (x86)\Expresii\Locale\ja\ LC_MESSAGES. You will still choose Japanese in Expresii to see your changes.
For the hotkey list file, it's standard HTML file that you can edit with any HTML editor.
Please contact us first before you start:
2016/11/28 : Korean deployed (thanks to koipurin)
2016/11/23 : Korean underway
2016/11/22 : Finnish & Croatian deployed (thanks to Annukka Leppänen & Mirza Husadzic respectively)
2016/11/08 : Finnish & Croatian taken and underway
2016/09/27 : Spanish deployed (thanks to Francisco Cubas)
2016/09/19 : French deployed (thanks to Daniel Siron)
2016/08/26 : French and Spanish taken and underway
We already have Japanese & Chinese translations.