Add translation note to CONTRIBUTING.md

Author: meshcollider

CONTRIBUTING.md

@@ -81,6 +81,10 @@ Examples:
     Qt: Add feed bump button
     Trivial: Fix typo in init.cpp
 
+Note that translations should not be submitted as pull requests, please see
+[Translation Process](https://github.com/bitcoin/bitcoin/blob/master/doc/translation_process.md) 
+for more information on helping with translations.
+
 If a pull request is specifically not to be considered for merging (yet) please
 prefix the title with [WIP] or use [Tasks Lists](https://help.github.com/articles/basic-writing-and-formatting-syntax/#task-lists)
 in the body of the pull request to indicate tasks are pending.