Comment 16 for bug 1294858

We had what looks like exactly the same headache with GIMP on Mac a month ago. In case it helps, here's the writeup of the problem and solution:

>
Fault finding eventually got us to running
$ locale
which on my machine resulted in LANG and LC_ALL being blank whereas Partha's machine offered

LANG="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_CTYPE="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_ALL=

After running

$ export LC_ALL="de_DE.UTF-8
$ cd /ApplicationS/Gimp-2.8.app/Contents/MacOS
$ ./gimp-bin

It came up in German and following
$ export LC_ALL="gd.UTF-8

it came up in Gaelic. Partha diagnosed that "The previous default you had was "C" which mean gtk will always provide you an English interface." Partha's current build has some fix that means that the dropdown now shows all languages and implements them correctly.

And Partha added:
>
I use a script to launch Gimp and make all the libraries available. The script is inspired by Simone's 2.6.x script and modified for my
builds.

So, I set the language in the script and you all set. The script obviously creates a local environment and so it does not interfere
with the User Interface language.

Without the language setting, GTK will set the locale to "C" and Gimp will not be able to change it. With a language setting, GTK is happy and Gimp is happy.