_profile: Add back "LC_CTYPE=zh_CN.UTF-8"

NOTE
----
FontConfig will check the language against system locales, in order
to prepend/enable corresponding fonts.

For example, Noto CJK font provides multiple variants for the same glyph
regions, e.g., "Noto Sans CJK JP" and "Noto Sans CJK SC" may *both* be
selected/matched to display Chinese, and the former may even get
precedence which is unexpected (see also: Han Unification [1]).

Therefore, "LC_CTYPE=zh_CN.UTF-8" should be added back, and explicitly
select the wanted/correct font (e.g., "Noto Sans CJK SC") for specific
language (e.g., "zh-cn").

[1] https://en.wikipedia.org/wiki/Han_unification

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