fix(UI): i18n: improve naming (#7539)

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### Tests

- I added test coverage for Go changes...
  - [ ] in their respective `*_test.go` for unit tests.
  - [ ] in the `tests/integration` directory if it involves interactions with a live Forgejo server.
- I added test coverage for JavaScript changes...
  - [ ] in `web_src/js/*.test.js` if it can be unit tested.
  - [ ] in `tests/e2e/*.test.e2e.js` if it requires interactions with a live Forgejo server (see also the [developer guide for JavaScript testing](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/tests/e2e/README.md#end-to-end-tests)).
  - [x] I will test the UI with a screenshot. And attach it in a comment when test has passed.

### Documentation

- [x] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
https://codeberg.org/forgejo/docs/pulls/1145

- [ ] I did not document these changes and I do not expect someone else to do it.

### Release notes

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- [ ] I want the title to show in the release notes with a link to this pull request.
- [ ] I want the content of the `release-notes/<pull request number>.md` to be be used for the release notes instead of the title.

### Reason for the PR?

The reason is to correct the naming of the lang in the UI. It was discussed in the matrix chat and requested by @0ko.
https://matrix.to/#/!UJgSZwuZLRYXEOyjPb:matrix.org/$TbMlNm9L1P9gHFwJYZ3vTIPBKtUHyaoQVEDdzfTQIxI?via=matrix.org&via=envs.net&via=mozilla.org

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7539
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: tacaly <frederick@tacaly.com>
Co-committed-by: tacaly <frederick@tacaly.com>

custom/conf/app.example.ini

@@ -2412,7 +2412,7 @@ LEVEL = Info
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; The first locale will be used as the default if user browser's language doesn't match any locale in the list.
 ;LANGS = en-US,zh-CN,zh-HK,zh-TW,da,de-DE,nds,fr-FR,nl-NL,lv-LV,ru-RU,uk-UA,ja-JP,es-ES,pt-BR,pt-PT,pl-PL,bg,it-IT,fi-FI,fil,eo,tr-TR,cs-CZ,sl,sv-SE,ko-KR,el-GR,fa-IR,hu-HU,id-ID
-;NAMES = English,简体中文,繁體中文（香港）,繁體中文（台灣）,Danish,Deutsch,Plattdüütsch,Français,Nederlands,Latviešu,Русский,Українська,日本語,Español,Português do Brasil,Português de Portugal,Polski,Български,Italiano,Suomi,Filipino,Esperanto,Türkçe,Čeština,Slovenščina,Svenska,한국어,Ελληνικά,فارسی,Magyar nyelv,Bahasa Indonesia
+;NAMES = English,简体中文,繁體中文（香港）,繁體中文（台灣）,Dansk,Deutsch,Plattdüütsch,Français,Nederlands,Latviešu,Русский,Українська,日本語,Español,Português do Brasil,Português de Portugal,Polski,Български,Italiano,Suomi,Filipino,Esperanto,Türkçe,Čeština,Slovenščina,Svenska,한국어,Ελληνικά,فارسی,Magyar nyelv,Bahasa Indonesia
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

modules/setting/i18n.go

@@ -9,7 +9,7 @@ var defaultI18nLangNames = []string{
 	"zh-CN", "简体中文",
 	"zh-HK", "繁體中文（香港）",
 	"zh-TW", "繁體中文（台灣）",
-	"da", "Danish",
+	"da", "Dansk",
 	"de-DE", "Deutsch",
 	"nds", "Plattdüütsch",
 	"fr-FR", "Français",