To keep the browser.startup.homepage pref value out of translators
hands, all of the localized browser.properties files have been
removed and the pref value (about:tor) has been moved to a new
non-localized.properties file.

We no longer provide a value for spellchecker.dictionary, which
means non en-US users will probably need to set their spellchecking
language from the browser context menu or via about:config after
they install a dictionary for their language. The browser will also
consult the LANG environment variable and use a "default default"
of en-US if an en-US dictionary is installed.