Require user to actively select language

Avoids having every project being translated to Acholi

Fixes #781
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/forms.py

@@ -723,7 +723,7 @@ class NewLanguageForm(forms.Form):
 
     def __init__(self, *args, **kwargs):
         super(NewLanguageForm, self).__init__(*args, **kwargs)
-        choices = sort_choices([
+        choices = sort_choices([('', _('Please select'))] + [
             (l.code, l.__unicode__()) for l in Language.objects.all()
         ])
         self.fields['lang'].choices = choices

weblate/trans/views/basic.py

@@ -479,7 +479,10 @@ def new_language(request, project, subproject):
     else:
         messages.error(
             request,
-            _('Failed to process new translation request!')
+            _(
+                'Please choose the language into which '
+                'you would like to translate.'
+            )
         )
 
     return redirect(