fix(locale): the VM page's and Settings page's messages show translated

The VM page's and the Settings page's views marked their messages with
gettext_noop, so every message they gave (a refused resize, a saved
setting, a QoS change, a busy VM) showed in English whatever the
language, though the catalogs translate them. They translate in the
request's language now; their module-level texts lazily. The Settings
page's group titles stay English in the view, as the page links them
by their slugs and translates them itself.

Two values went into translated messages as English codes: a job's
state ("... is running on this resource") and a QoS direction ("Remove
the inbound limit ..."). They are named as the pages name them.

appsettings/tests/test_appsettings.py

@@ -30,6 +30,12 @@ class AppSettingsTestCase(TestCase):
         choice = choice[:choice.index("</select>")]
         self.assertEqual(re.findall(r'<option value="([^"]+)"', choice), ["en", "tr", "zh-hans"])
 
+    def test_the_page_answers_in_the_users_language(self):
+        response = self.client.post(reverse("appsettings"), {}, HTTP_ACCEPT_LANGUAGE="tr", follow=True)
+        self.assertEqual([str(m) for m in get_messages(response.wsgi_request)], ["Hiçbir şey değişmedi"])
+        # the groups' links stay the English slugs: the page translates only their titles
+        self.assertContains(response, 'href="#new-vm-defaults"')
+
     def test_appsettings_update_setting(self):
         setting = AppSettings.objects.get(key="SHOW_ACCESS_ROOT_PASSWORD")
         original_value = setting.value