Sitecore displaying Japanese even though language is set to English

Question

Some elements of Sitecore have randomly started using Japanese. I have checked for the following issues:

• I have checked to make sure our Sitecore instance is set to English.
• I looked through the entire solution for references to jp but it doesn't seem that it is being hardcoded into anywhere.

This has been affecting the following:

• RTE's (the element selection menu e.g h1, h2, h3... is in Japanese)

• Our validation rules:

  

Anyone had a similar issue.

This is on Sitecore 7.5.

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UPDATE 1

I see that some items under core/sitecore/system/Dictionary have the Phrase field set to Japanese text. Could this have anything to do with it?

Answer 1

Figured it out. I'm assuming this was a bug in Sitecore but what happened is that all the Japanese translations in the core database's dictionary were moved to the English versions. This meant that it would translate to Japanese if it detected the mode was set to English.

Answer 2

The user you're logging in with, what language preferences is set for it?

Is one thing that the Sitecore site runs in English, but a CMS editor user can still prefer to operate Sitecore in another language.

Control Panel => Region and Language settings