fix i18n flicker on auth pages (calcom#1183)

* fix flicker on `/auth/login`

* fix flicker on logout

* fix flicker on error

* fix i18n flicker on signup

chore: change calendso strings to cal.com (calcom#707)

* chore: change calendso strings to cal.com

* rebase LICENSE

* rebase LICENSE

* strings that were missed

Co-authored-by: Bailey Pumfleet <pumfleet@hey.com>