Languages! In the official version as it stands, the plan is to have languages represent more dialects than foreign tongues. You don’t have to mechanically represent any proficiency with them.
Here is an alternative. At generation, you can spend either the action for your heritage or the action for your background to get a language instead (both if desired, to be tri-lingual.)
After generation, to learn a new language, you must fill a clock (default suggestion is 10 segments, studying as a downtime project.) At the end of that time, as soon as you have 8 experience, you can purchase that language as a special ability. From then on you are fluent. When you get half the segments, you can communicate at a basic level.