Translation - Ini files direct.
I read the wiki on languages. Not sure what the "Joomla Translation Manager in the backend." is?
You can also help by translating Joomdle documentation to other languages. Doing this is very simple with the wiki:
First, create the page Main_Page/LANGUAGE_CODE (where LANGUAGE_CODE is your language code) copying and translating the english one.
Then, contact Joomdle team so we can update the language selection menu to add the new language. From then on, you will be able to translate any page by creating Page/LANGUAGE_CODE.
Remember to add:
This sounds complicated to me. Can't I just translate the ini files
and move them to /language/id-ID/
I guess our docs are aout of date on that area. Translation manager was used in previous Joomla versions, but I am not sure if there is something similar for J3.x. I will look at it and update the docs.