1.0.6 — localized interface, clearer MyMemory message

- The interface is now available in English, German, French, Russian and
Japanese. It follows Thunderbird's own language; any other language shows
English. The language names in the settings appear in your language as well.
- Clearer message when MyMemory receives the same language twice. MyMemory
refuses a request whose source and target languages are identical, and its own
reply says nothing about which setting to change. The add-on now checks the
pair before sending anything, and names the setting: "Email language" is the
language your emails are written in, and it cannot be the same as the target
language. Google Translate and DeepL are unaffected — they detect the source
language themselves.
- The English wording was revised throughout, including the optional MyMemory
e-mail field, which now states plainly that it is neither a login nor a
registration.
- The bundled DOMPurify library was updated to 3.4.17.

1.0.4 — translate again

The translation panel now has a ↻ button next to the close button. It
translates the open email again from scratch, ignoring the stored result —
useful after switching translation engine, after correcting the "Email
language" setting for MyMemory, or whenever a translation was not what you
expected. Until now, re-opening the email simply showed the stored translation
again.

- Fixed a bug where the translation panel could occasionally show an
old, unrelated email's translation instead of the one you actually
opened.
- Added a required opt-in step: the extension now asks for your
explicit permission in Settings before sending any email text to a
translation service (Google Translate, MyMemory, or DeepL). Nothing
is sent until you turn this on.
- Properly declared the vendored DOMPurify library.

Initial release. Supports Google Translate (default, no key required), MyMemory, and DeepL. Shows translation in a split view alongside the original email.