i18n fixes (#17184)

* update PR template

* fix hook

* fix input

* fix hook

* add all audio detector keys

* add frigate+ keys

* fix spelling, formatting, and spacing

* fix labels

* capitalization

* fix timestamp

* fix menu

* fix plus text

* fix download label

* docs

* fix docs build

* fix docs formatting

docs/docs/development/contributing.md

@@ -235,3 +235,14 @@ When testing nginx config changes from within the dev container, the following c
 ```console
 sudo cp docker/main/rootfs/usr/local/nginx/conf/* /usr/local/nginx/conf/ && sudo /usr/local/nginx/sbin/nginx -s reload
 ```
+
+## Contributing translations of the Web UI
+
+If you'd like to contribute translations to Frigate, please follow these steps:
+
+1. Fork the repository and create a new branch specifically for your translation work
+2. Locate the localization files in the web/public/locales directory
+3. Add or modify the appropriate language JSON files, maintaining the existing key structure while translating only the values
+4. Ensure your translations maintain proper formatting, including any placeholder variables (like `{{example}}`)
+5. Before submitting, thoroughly review the UI
+6. When creating your PR, include a brief description of the languages you've added or updated, and reference any related issues