- change api method listInstallableRuleset to listRulesets
- add api method getRuleset
- add api method setRuleset
- change api method toggleInstalledRuleset to toggleRuleset
- fix reload action on multiselect

just a pattern that returns from time to time, encapsulated into a new method so we can remove some code.

PR: https://forum.opnsense.org/index.php?topic=2090

o $g['theme'] usage converted
o $g['language'] usage zapped
o globals.inc removed

"device polling" changes also require a reboot

The changes won't happen until the interface is re-configured, just like for the other settings.

Taken from: https://translate.opnsense.org/

Taken from: https://translate.opnsense.org/

(legacy) firewall_rules.php redirect to correct page for "Block bogon networks", closes https://github.com/opnsense/core/issues/713

Long story short: we don't want contrib code inside src/opnsense/contrib
so a few things need to be shuffled.  First pass is moving the current
contrib stuff to the same location instead and migrating the non-code
tzdata file.

o Can't unset the session var anymore resulting in permanent
  login error message display until login was successful.
o Remove some padding and make permanent room for the error
  message so that the container doesn't grow after submit.
o Move the workaround to a permanent position in <button/>.
o Move the copyright right line right underneath the container.