5.3.3. Installing a locale for Enigmail

Enigmail is available in many languages. The following locales are already included in Enigmail 1.0.0:

ar Arabic it-IT Italian
ca Catalan ja-JP Japanese
de-AT German (Austria) ko-KR Korean
de-DE German (Germany) nb-NO Norwegian
el Greek pl-PL Polish
en-US English (USA) pt-BR Portuguese (Brazil)
es-ES Spanish pt-PT Portuguese (Portugal)
fi-FI Finnish ru-RU Russian
fr-FR French sl-SI Slovenian
gl-ES Galician sv-SE Swedish
hu-HU Hungarian zh-CN Chinese

If you want to use Enigmail localised in a language that is not listed above, you need the relevant Language Pack. To do so, download and install Enigmail as previously explained. Then, before restarting the mailclient, go to http://enigmail.mozdev.org/download/langpack.php and choose the Language Pack relevant to the preferred language. Download the Language Pack, which is a XPI file, and install it just like you did with Enigmail.
Then, restart the mailclient.

If Enigmail still appears in English after the restart, you need to switch once to the default language English (US), restart the mailclient, switch back to your localisation, then restart the mailclient again.
To change the language in SeaMonkey, use the menu command Edit → Preferences... → Appearance → Languages/Content. To change the language in Thunderbird, the easiest way is to install Benjamin Smedberg's Locale Switcher extension, available at https://addons.mozilla.org/enUS/thunderbird/addon/356.

A note for testers: Enigmail nightly builds are not localized. They come without Language Packs and are meant to be tested in English only.