Add Chinese localization

[shamoon]

Addresses #134 (comment)

It looks like there have been some changes to Chinese Simplified locale string and other things so would be good if other(s) could test to make sure this is OK. Obviously I tested (screenshot) this, fyi I created a config like:

"configurations": {
	"production": {
	...
		"zh": {
			"localize": ["en-US"]
		}
	}
}
...
"serve": {
	"configurations": {
	...
		"zh": {
			"browserTarget": "paperless-ui:build:zh"
		}
	}
}

[coveralls]

Pull Request Test Coverage Report for Build 1977574982

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 9 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.07%) to 92.259%

---

Files with Coverage Reduction	New Missed Lines	%
documents/file_handling.py	1	96.47%
documents/index.py	2	94.19%
paperless/settings.py	6	82.5%

Totals
Change from base Build 1977569533:	-0.07%
Covered Lines:	4100
Relevant Lines:	4444

---

💛 - Coveralls

[qcasey]

Structurally this looks fine, although I can't read Chinese.

[FaintGhost]

Hi @shamoon I built it myself and tested the simplified chinese translation, it looks great! But I found some untranslated strings that are not on crowdin either.

[shamoon]

Thanks for verifying @FaintGhost (and for translating of course)! Hmm that’s the Django admin, I’ll take a look

[shamoon]

@paperless-ngx/backend do any of you Django folks know why #247 (comment) ? I checked with other languages and they seem to translate those strings just fine but none of the languages include those strings in the .po file, I think the translations are automatically generated by Django, I just dont know why not for Chinese Simplified.

[github-actions]

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