Fixed the localization chart

Since an Github Update, the localization chart wasn't displayed any more.
So I reached out to the Github support and they gave me one with less redirects.

:-)

README.md

@@ -85,7 +85,7 @@ for more instructions.
 
 Translation progress so far:
 
-[![Transifex](https://www.transifex.com/projects/p/ampache/resource/messagespot/chart/image_png)](https://www.transifex.com/projects/p/ampache/)
+[![](https://www.transifex.com/_/charts/redirects/ampache/ampache/image_png/messagespot/)](https://www.transifex.com/projects/p/ampache/)
 
 Credits
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