uitest: set en_US.UTF8 for the LibreOffice instance

Change-Id: If4726804c2b967582cbf1a4e816c1c7bee01aeeb
Reviewed-on: https://gerrit.libreoffice.org/38626Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

solenv/gbuild/UITest.mk

@@ -26,7 +26,7 @@ gb_UITest_GDBTRACE := --gdb
 gb_UITest__interactive := $(true)
 endif
 
-gb_UITest_COMMAND := $(gb_UITest_EXECUTABLE) $(SRCDIR)/uitest/test_main.py
+gb_UITest_COMMAND := LIBO_LANG=en_US.UTF-8 $(gb_UITest_EXECUTABLE) $(SRCDIR)/uitest/test_main.py
 
 .PHONY : $(call gb_UITest_get_clean_target,%)
 $(call gb_UITest_get_clean_target,%) :

uitest/libreoffice/connection.py

@@ -8,6 +8,7 @@
 import subprocess
 import time
 import uuid
+import os
 
 try:
     import pyuno
@@ -76,7 +77,14 @@ class OfficeConnection:
             argv.insert(3, "--args")
             argv[4] = argv[4].replace("soffice", "soffice.bin")
 
-        self.pro = subprocess.Popen(argv)
+        env = None
+        environ = dict(os.environ)
+        if 'LIBO_LANG' in environ:
+            env = environ
+            env['LC_ALL'] = environ['LIBO_LANG']
+            print(env)
+
+        self.pro = subprocess.Popen(argv, env=env)
         return self.pro
 
     def connect(self, socket):