Fix several English locale issues as suggested in #35015:
- Rename `enterred` to `entered` in locale keys
(`form.enterred_invalid_*`)
and update all Go source references accordingly
- Fix subject-verb agreement in `oauth2_applications_desc` and
`oauth2_application_create_description`
- Improve awkward phrasing in `startpage.license_desc`
Only `locale_en-US.json` is modified; other locales are managed by
Crowdin.
Ref #35015
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Signed-off-by: yshyuk <dbsrbtkd94@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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