Revert "Revert "Bug 906892: Change download title and base template title suffix""

This reverts commit 1ca148677af441d46a0ac53efc149ebff7d26776.
This is the reversion of the reversion from earlier due to l10n.
L10n is now ready, so we're doing this again.

Conflicts:
	bedrock/base/templates/base-resp.html
	bedrock/base/templates/base.html