Move default Tor Browser component in Weblate
Tor Browser devs are removing the old properties and dtd files and adding more strings to the Fluent files.
In Weblate, when several files to translate are on the same branch, you can use one component as an internal weblate repo, as this saves resources and space.
For the Tor Browser, many components are tied to the `aboutDialog.dtd` component, but this file will dissapper eventually, so I need to choose another default file (tor-browser.ftl) and tie the rest of the components to it.