Always set own home directory

This way we avoid problems when running in web server environment with
no HOME set.
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/util.py

@@ -28,6 +28,7 @@ import os
 import urlparse
 import hashlib
 import weblate
+from weblate.trans.data import data_dir
 
 try:
     import rollbar
@@ -156,11 +157,12 @@ def get_clean_env(extra=None):
     Returns cleaned up environment for subprocess execution.
     """
     environ = {
-        'LANG': 'en_US.UTF-8'
+        'LANG': 'en_US.UTF-8',
+        'HOME': data_dir('home'),
     }
     if extra is not None:
         environ.update(extra)
-    variables = ('HOME', 'PATH', 'LD_LIBRARY_PATH')
+    variables = ('PATH', 'LD_LIBRARY_PATH')
     for var in variables:
         if var in os.environ:
             environ[var] = os.environ[var]