In the elementary tree all translatable messages are enclosed in a E_() macro, and since this macro was undefined in Makevars all massages was not included in catalog.
If some coder think that the E domain is useless, or deprecated or whatever, please remove it and update all source files accordingly.
Please spend time looking at those as I had to do few stuff
manually and I may have borked some of them.
Side note question, why do we have ko.po and ko_KR.po ?