remove checks for mbstring.func_overload

This ini setting no longer exists in PHP8, so we don't need to check
for it.

Finalise formal Hungarian translation

translate html and text string for signature

Default only text string exists, via localized translation a wiki admin
can add his/her own (html) version.

Cleanup of the mail text signature.

Done:
Cleanup of the mail text signature.
The signature is deleted from the txt files and moved in to lang.php
Mailer.class.php updated to insert the signature

F

Cleanup of the mail text signature.

Done:
Cleanup of the mail text signature.
The signature is deleted from the txt files and moved in to lang.php
Mailer.class.php updated to insert the signature

Fix:
- Cleaner text
- no more "-- " "--" "---" "----" problems.
- mailwrap.html is not needed anymore an can be deleted (?)

Changed files in all languages:
lang.php
mailtext.txt
password.txt
registermail.txt
subscr_digest.txt
subscr_list.txt
subscr_single.txt
uploadmail.txt
pwconfirm.txt
showrev.txt

delete?:
mailwrap.html

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translation update