plug-ins: fix relocatability of the Python Console.

If we were running Gimp.locale_directory() at the very start of the
script, it would append before _gimp_reloc_init_lib() had happened, and
therefore the returned value would be the non-relocated locale
directory.

Calling this inside set_i18n() happens later, and also feels like the
proper place for this code.

plug-ins/python/python-console/python-console.py

@@ -34,7 +34,6 @@ import pyconsole
 
 import gettext
 textdomain = "gimp30-python"
-gettext.bindtextdomain(textdomain, Gimp.locale_directory())
 gettext.textdomain(textdomain)
 _ = gettext.gettext
 
@@ -303,6 +302,7 @@ def run(procedure, config, data):
 class PythonConsole (Gimp.PlugIn):
     ## GimpPlugIn virtual methods ##
     def do_set_i18n(self, name):
+        gettext.bindtextdomain(textdomain, Gimp.locale_directory())
         return True, 'gimp30-python', None
 
     def do_query_procedures(self):