This behavior is duplicated from Aquarium, and may seem strange but is very useful. Normally, everything in the code is in “en-us”. However, the “en-us” translation catalog is usually empty. If the user requests ["en-us", "zh-cn"] and a translation isn’t found for a string in “en-us”, you don’t want gettext to fallback to “zh-cn”. You want it to just use the string itself. Hence, if a string isn’t found in the language catalog, the string in the source code will be used.
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