Given we had instruments and the performance system that offer buffs and the like. Would it be possible to leverage the same system to offer a temporary buff when conversing with someone in that given language.
Say someone speaks Japanese, and you don't if they address you, over a period of time depending on skills/stats, you gain a buff to the % you increase your language learned per UE spent. That buff can depending upon the speaking individuals intelligence (to teach) and the language level they have.
It does not have to be a huge boost, but it opens up the options for people who invest in languages direct ways to make it into a marketable skill. Open up languages to more players hopefully and give actual RP elements to learning a language rather than just "I read it in a book" or "I learnt it from x NPC or y PC".