Add TorStrings module for localization

browser/modules/TorStrings.jsm

browser/modules/moz.build

toolkit/torbutton/chrome/locale/en-US/aboutDialog.dtd

toolkit/torbutton/chrome/locale/en-US/aboutTBUpdate.dtd

toolkit/torbutton/chrome/locale/en-US/aboutTor.dtd

toolkit/torbutton/chrome/locale/en-US/brand.dtd

toolkit/torbutton/chrome/locale/en-US/brand.properties

toolkit/torbutton/chrome/locale/en-US/branding/brand.ftl

...orbutton/chrome/locale/en-US/browserOnboarding.properties

toolkit/torbutton/chrome/locale/en-US/onboarding.properties

...it/torbutton/chrome/locale/en-US/onionLocation.properties

toolkit/torbutton/chrome/locale/en-US/rulesets.properties

toolkit/torbutton/chrome/locale/en-US/settings.properties

toolkit/torbutton/chrome/locale/en-US/torConnect.properties

toolkit/torbutton/chrome/locale/en-US/torbutton.dtd

toolkit/torbutton/chrome/locale/en-US/torbutton.properties

toolkit/torbutton/chrome/locale/en-US/torlauncher.properties

toolkit/torbutton/jar.mn