Minerva Neue: Stop mixing variant names with language names in the interlanguage menu.
Using variant names as language names were confusing, it caused issues like "Missing in 'Unconverted (language variant)' >".
We should stop mixing them.
This includes:
* The language selection menu
* The "Missing in <language name>" notice
Reported by: Levi (列维劳德)
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The language selection menu:
{F37145188 width=320}
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The "Missing in <language name>" notice:
{F37144488 width=320}
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**Solution**:
{F37145192 width=320}
# QA steps
## Test case 1
Visit https://zh.m.wikipedia.org/wiki/%E9%A9%AC%E4%BF%AE%C2%B7%E8%B4%B9%E6%96%AF%E6%B1%80 and click the language button
Expected: 大陆简体 appears once in list of language variants.
Actual: 大陆简体 appears in language variants AND language list
## Test case 2
Go to https://zh.m.wikipedia.org/wiki/%E5%90%89%E6%9E%97%E7%9C%81%E5%8F%8B%E5%A5%BD%E5%9F%8E%E5%B8%82%E5%88%97%E8%A1%A8.
Check https://zh.m.wikipedia.org/wiki/%E5%90%89%E6%9E%97%E7%9C%81%E5%8F%8B%E5%A5%BD%E5%9F%8E%E5%B8%82%E5%88%97%E8%A1%A8 has no language versions, only variants.
Expected:
* The language list should be empty
Actual:
The language list is not empty - it contains variants