Merge pull request #270 from ethereum/stablecoins-redirect

Redirect `/en/stablecoins` to `/stablecoins`

Author: wackerow

public/_redirects

@@ -178,4 +178,6 @@
 
 /studio /en/deprecated-software/#ethereum-studio 301!
 
-/*/studio /:splat/deprecated-software/#ethereum-studio 301!
+/*/studio /:splat/deprecated-software/#ethereum-studio 301!
+
+/en/stablecoins /stablecoins 301!