Fixed locale test in the presence of LANGUAGE

According to GNU documents, the priority order of language variables
is LANGUAGE, LC_ALL, LC_*, LANG. Therefore, if LANGUAGE is set, it
overrides the LC_ALL setting from the test. An empty value is ignored,
and setting it to empty is easier to deal with than just deleting the
variable.

Also fixed the Google translate fail esperanto grammar.

Fixes bug 1235058

Change-Id: Ic97b90dfc21997e19cc473250794a9b3c526beb5

Author: StevenLang

test/unit/locale/eo.po

@@ -1,2 +1,2 @@
 msgid "test message"
-msgstr "testo mesaĝon"
+msgstr "prova mesaĝo"

test/unit/locale/messages.mo

@@ -31,30 +31,29 @@ def check_output(*popenargs, **kwargs):
 class TestTranslations(unittest.TestCase):
 
     def setUp(self):
-        self.la = os.environ.get('LC_ALL')
-        self.sl = os.environ.get('SWIFT_LOCALEDIR')
+        self.orig_env = {}
+        for var in 'LC_ALL', 'SWIFT_LOCALEDIR', 'LANGUAGE':
+            self.orig_env[var] = os.environ.get(var)
         os.environ['LC_ALL'] = 'eo'
         os.environ['SWIFT_LOCALEDIR'] = os.path.dirname(__file__)
+        os.environ['LANGUAGE'] = ''
         self.orig_stop = threading._DummyThread._Thread__stop
         # See http://stackoverflow.com/questions/13193278/\
         #     understand-python-threading-bug
         threading._DummyThread._Thread__stop = lambda x: 42
 
     def tearDown(self):
-        if self.la is not None:
-            os.environ['LC_ALL'] = self.la
-        else:
-            del os.environ['LC_ALL']
-        if self.sl is not None:
-            os.environ['SWIFT_LOCALEDIR'] = self.sl
-        else:
-            del os.environ['SWIFT_LOCALEDIR']
+        for var, val in self.orig_env.iteritems():
+            if val is not None:
+                os.environ[var] = val
+            else:
+                del os.environ[var]
         threading._DummyThread._Thread__stop = self.orig_stop
 
     def test_translations(self):
         path = ':'.join(sys.path)
         translated_message = check_output(['python', __file__, path])
-        self.assertEquals(translated_message, 'testo mesaĝon\n')
+        self.assertEquals(translated_message, 'prova mesaĝo\n')
 
 
 if __name__ == "__main__":