chore: prepare v3.3.0

[susnux]

1. Add our consistent changelog formatting script.
2. Prepare new release.

🚀 Enhancements

• feat: add method to format relative time by @susnux in feat: add method to format relative time #921

🐛 Fixed bugs

• fix: export types used in gettext exports by @susnux in fix: export types used in gettext exports #905
• fix(translations): use language instead of locale + refactor the loadTranslations method by @susnux in fix(translations): use language instead of locale + refactor the loadTranslations method #927
• fix(locale): fallback to device preferences instead of 'en' by @ShGKme in fix(locale): fallback to device preferences instead of 'en' #864

Other changes

• docs(readme): update badges by @st3iny in docs(readme): update badges #904
• refactor: simplify loadTranslations by @susnux in refactor: simplify loadTranslations #928
• chore(deps): drop unnecessary @types/dompurify #903 (max-nextcloud)