Playing the mod, I encountered two issues.
First: it seems that there are missing text lines for diplomacy, when I refuse to give a tribute to another civ. See this pic.
Thanks for the report. Found the problem, will be fixed in 1.23.
Second: my game came to an end because everything got stuck at a certain turn at "waiting for the other civilizations". I can use the interface but it seems that my next turn never comes. I'm attaching the savegame (zipped): just end the turn and this event should trigger.
From the FAQ in this thread:
There is a nasty bug that can cause a unit to get stuck in an endless cycle of joining/leaving a unit group. This can happen to any type of unit but it seems to be more common with Naval units, especially those with hidden nationality, or those with cargo passing through other units with cargo. This bug is present in unmodded BTS and unfortunately it cannot be completely eliminated. However, I've implemented a method to force a stuck AI player to stop moving its units: Press 'Ctrl-C' to trigger this (can be 'CMD-C' on OS X, depending on your settings).