Feat: enable xfs-quotas.

This feature-request added a long time ago by @ftimme and also reasked again by other user @alienn 

With this few lines it should solve issue #1948 for ispconfig-3.1

See merge request !317

French translation fixes

Removed \ in french translation which leads to a syntax error and breaks client addition page.
Updated various translations

See merge request !320

client addition page.

layout-fix for company name



See merge request !319

Master



See merge request !318

Changed behaviour of UFW installation. Do not enable it by deafult as the firewall will get enabled autmatically when a firewall record gets added in ispconfig. Enabling it without that record, the Firewall would lock out the user on next reboot.

- fixed missing language file entries

Added missing strings to language file.

Added a check to prevent that password protected ssl keys get saved. Thanks to Timo for finding the issue.