Your first step should be to download the "starter" pack from the Tribiq Store.
Go to the Languages Panel in your Storekeeper, click on the red button with the tooltip "Goto Tribiq Store for additional Languages", and download the desired Language Pack.

This gives the CMS a base pack to start with.
Your next step should be to get a translation for every phrase that you use on your site.
You can do this using the Storekeeper, by translating them one by one, but the easiest way is to take a CSV Export. You can take a CSV Export by clicking on a Language Pack in the Storekeeper and pressing the Export button.

You can then send the resulting .csv off to a translator to fill in the missing phrases, and then re-import it back into the CMS.
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