Default custom_strings.xml missing from res folder but exist on

I'm really glad to see the brand-new translation site up and running well. Thanks for that~
But there's something wrong: when I perform an sync and compile, some strings are still left in English (for e.g.: settings of Messaging app are almost in English, not Chinese as I selected in Android Settings). I checked the source code, and find that there are no custom_strings.xml, custom_arrays.xml, etc under packages/apps/Mms/res/values-zh-rCN (android-4.4 branch). However, these files can be found on and android-4.3 branch on GitHub.
Does that mean we should do a translation import, or is using the wrong branch?
Sony Xperia TX with OmniROM 4.4
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