Hi, and thank you for your interest!
Call Recorder is being translated using Weblate, a web tool designed to ease translating for both developers and translators.
Translation project for Call Recorder into Sinhala currently contains 177 strings for translation and is 1.1% complete.
If you would like to contribute to translation of Call Recorder, you need to register on this server.
Once you have activated your account just proceed to the translation section.