At the project page on Sourceforge, you will find among other tools a bug tracker and an help forum.
If you want to translate TexMaths into your favorite language, please do the following steps:
On Linux, if you want to check your translation, you can run the command ./makepkg 0.XX in the TexMaths root directory, where 0.XX is the TexMaths version number (ex: run ./makepkg 0.43 for version 0.43). Then reinstall the translated version in LibreOffice.
You can send me bugs, feature requests, patches, etc. at this mail address:
I'll do my best to answer shortly but please don't blame me if things take some more time...