[mod] replace /translations.js by embedded JSON

In webapp.py, there is a new function "get_translations" lists available translations

Close #2064

searx/webapp.py

@@ -362,6 +362,15 @@ def image_proxify(url):
                             urlencode(dict(url=url.encode(), h=h)))
 
 
+def get_translations():
+    return {
+        # when overpass AJAX request fails (on a map result)
+        'could_not_load': gettext('could not load data'),
+        # when there is autocompletion
+        'no_item_found': gettext('No item found')
+    }
+
+
 def render(template_name, override_theme=None, **kwargs):
     disabled_engines = request.preferences.engines.get_disabled()
 
@@ -421,6 +430,8 @@ def render(template_name, override_theme=None, **kwargs):
 
     kwargs['brand'] = brand
 
+    kwargs['translations'] = json.dumps(get_translations(), separators=(',', ':'))
+
     kwargs['scripts'] = set()
     kwargs['endpoint'] = 'results' if 'q' in kwargs else request.endpoint
     for plugin in request.user_plugins:
@@ -1084,14 +1095,6 @@ def config():
     })
 
 
-@app.route('/translations.js')
-def js_translations():
-    return render(
-        'translations.js.tpl',
-        override_theme='__common__',
-    ), {'Content-Type': 'text/javascript; charset=UTF-8'}
-
-
 @app.errorhandler(404)
 def page_not_found(e):
     return render('404.html'), 404