mail-passwords/de.text: use render instead of insert

Signed-off-by: kardan <kardan@riseup.net>
note on german thunderbird help page
note on how to change github upstream for README.md
updated enigmail / pgp link
updated english jabber page
mayfirst heartbleed statement, german
fbi press release, german
Merge branch 'master' of ssh://github.com/kradan/riseup_help