(cherry picked from commit b9095a55)
(cherry picked from commit 1bf8b3aa)

(cherry picked from commit 6ae6e594)

(cherry picked from commit 52e5e3a3)

(cherry picked from commit da90e813)

Suggested by: @fabianfrz

(cherry picked from commit aa19f4b1)

(cherry picked from commit f759d902)

(cherry picked from commit 5f3538e4)

(cherry picked from commit 48b9b3ff)

(cherry picked from commit cc9cede6)

(cherry picked from commit 7aa0cd11)

(cherry picked from commit cbcfc496)

(cherry picked from commit dde019de)
(cherry picked from commit 4a91515d)

(cherry picked from commit a154812f)

(cherry picked from commit 3ecf0b8a)

(cherry picked from commit 3611e7fb)
(cherry picked from commit 49bb2b82)

It only makes debugging harder as our translations are being
completed one after the other.  Also has the positive side-
effect of freeing a few hard-to-do translations in the process.

(cherry picked from commit 955b73fd)

(cherry picked from commit 95268566)
(cherry picked from commit 5035c508)
(cherry picked from commit 7a068d5b)
(cherry picked from commit c598f2c8)
(cherry picked from commit 4e2b0079)
(cherry picked from commit f34f42d3)
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(cherry picked from commit 38efa570)
(cherry picked from commit 2c5768dc)

Only one function left.  :)

(cherry picked from commit 4e8debf8)

We'll go the long way here, bumping the values first before making
them configurable in the next iteration.

(cherry picked from commit 5ad1fa69)

(cherry picked from commit 7700f7c7)

(cherry picked from commit 4fc57390)

(cherry picked from commit 109fb513)
(cherry picked from commit 91cfcac9)
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(cherry picked from commit ac181f51)
(cherry picked from commit 937a0b9c)
(cherry picked from commit 08d84231)

(legacy) www: strip action attribute from forms where not needed, closes https://github.com/opnsense/core/issues/929

(cherry picked from commit 7ab0b346)

(cherry picked from commit 1842f0e1)

(cherry picked from commit d138098b)

(cherry picked from commit e485d7a4)

(cherry picked from commit 867ecd70)

(cherry picked from commit 5e07d411)

(cherry picked from commit 88803cca)

(cherry picked from commit 51531ca0)

(cherry picked from commit 8decc7a3)

(cherry picked from commit 00769b55)

All the work done by the amazing @adschellevis !

(user manager) add datepicker + small html style issues, closes https://github.com/opnsense/core/issues/552

(cherry picked from commit 956a13f6)

(cherry picked from commit 387cce08)

(cherry picked from commit e15693e9)

(cherry picked from commit 3d012d96)

(cherry picked from commit 78b5def3)

(cherry picked from commit 2325fc61)