Answer
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
1- Working in a tribunal is like working in any other institution created to promote the common good. Therefore, there is nothing wrong if a Muslim man or woman works as a translator for a tribunal.
2- If you have reasons to believe that the tribunal people are corrupt and are merely functioning to thwart justice and endorse corruption and oppression of the weak, you must resign and look for another job.
In responding to your question, Sheikh Ahmad Kutty, a senior lecturer and an Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states;
Here is the Wiki definition of a tribunal; “A tribunal, generally, is any person or institution with authority to judge, adjudicate on, or determine claims or disputes; whether or not it is called a tribunal in its title.”
So, working in a body or forum to adjudicate disputes cannot be deemed by itself haram. How can it be when the Quran orders us to resort to arbitrators to settle disputes if the intent is to bring peace and reconciliation among the people. We read in the Quran:
{There is no good in most of their secret converse, save for him who enjoins charity or kindness or reconciliation between men. And whosoever does that, seeking God’s Good Pleasure, We shall grant him a great reward.} (Al-Nisaa 4:114)
So, working in a tribunal is like working in any other institution created to promote the common good.
However, suppose after working with them, you have reasons to believe that the tribunal people are corrupt and are merely functioning to thwart justice and endorse corruption and oppression of the weak. In that case, one must resign and look for another job free from corruption.
Almighty Allah knows best.