change dialog style

fix for #582

translation fix

sort items in Menu.xml

o Adds a reinstall backend call
o Moves pkg_upgrade.sh into its own dir
o Don't clobber progress output when action is running
o Rename action to clearly reflect it's purpose
o Tweak EOL message a bit more

This is a test of how far we can go with our backend restructuring
without glitching firmware update temporarily.

FTP proxy via squid proxy server is available if needed.

o Deduplicate inside guiconfig.inc, one word needs to be changed...
o No spurious functions unless needed, it will likely linger forever.
o Be less specific about what the function will do, it may change.
o Remove "dismissable", there's no use dismissing static alerts.
o Zap filter switch case, firewall is used in the GUI anyway.
o Mop up the manual instances of the early pull request still present.
o Transform gettext(html) into sprintf(gettext, html).

firewall: show warning banner if firewall disabled

bring back loadbalancer descriptions