International characters
From MozillaZine Knowledge Base
- This article was written for Thunderbird but also applies to Mozilla Suite / SeaMonkey (though some menu sequences may differ).
The abcTajpu extension makes it easy to type accented letters or other international characters. You could also use the Windows character map (it's in "Accessories -> System Tools" if you use Windows XP) or Thunderbird's "Insert -> Characters and Symbols" menu command if you compose an HTML message.
If you want to use a right-to-left language such as Hebrew or Arabic install the BiDi extension.
The localization project page has links to localization efforts (other languages) that are not listed in the Thunderbird download page
