I did not gain the XPs when I voted the translations in English from Dutch.
I switched Dutch from English to English from Dutch for becoming more fluent in Dutch. But I noticed I did not win the points and my English-Dutch tier did not appear in my profile. “English from Dutch” (in Dutch: Engels via Nederlands) did not appear in the list of subscriptions either.
How to fix it?
The information provided by other users is correct. You don't get xp simply for rating translations at tier 1. The reason is that people first need to prove their skill in the language before they get rewarded with xp. How much xp you get per tier is mentioned in the explaination for Immersion Tiers. I have taken a screenshot and highlighted the rewards for checking translations. The fact that the tier doesn't show up on your profile does seem like a bug. It might not be a priority for the staff to fix, but thank you for reporting it anyway. I hope this answers your question.
And here is the Portuguese version if you prefer that: