[enh] mymemory translated engine added for multi-word translations

searx/settings.yml

@@ -499,6 +499,14 @@ engines:
     engine : dictzone
     shortcut : dc
 
+  - name : mymemory translated
+    engine : translated
+    shortcut : tl
+    timeout : 5.0
+    # You can use without an API key, but you are limited to 1000 words/day
+    # See : http://mymemory.translated.net/doc/usagelimits.php
+    # api_key : ''
+
 #The blekko technology and team have joined IBM Watson! -> https://blekko.com/
 #  - name : blekko images
 #    engine : blekko_images