#16 Add links to admin expiration email
#17 change link sent in prenotification email to normal users

#15 change picture_modify_prefilter $search, piwigo 16 compatibility

#14 add filter option "no expiry date"

New languages:
* México [MX]
* Estonian [EE]
* עברית [IL]
* 中文 (简体) [CN]

#12 PHP 8.2 compatibility

Make PHP 8.2 compatible

New languages:
* Greek (Ελληνικά [GR])
* Finnish (Finnish [FI])
* French Canadian (Français [QC])
* Italian (Italiano [IT])
* Japanese (日本語 [JP])
* Polish (Polski [PL])
* Portuguese (Português [PT])
* Russian (Русский [RU])
* Swedish (Svenska [SE])
* Turkish (Türkçe [TR])
* Traditional Chinese (中文 (繁體) [TW])

New languages:
* Icelandic (Íslenska [IS])
* Portuguese Brazil (Brasil [BR])

New languages:
* Catalan (Català [CA])
* Czech (Česky [CZ])
* Danish (Dansk [DK])
* German (Deutsch [DE])
* Spanish (Español [ES])
* Norwegian (Norsk bokmål [NO])
* Dutch (Nederlands [NL])
* Slovak (Slovensky [SK])
* Slovenian (Slovenščina [SL])

Adds prenotifications, seperate user and admin notifications.

Avoid fatal error when no users has downloaded the expired photo.

#1 photo page, unexpected backtick (fatal error on Bootstrap Darkroom)

Set an expiry date on photos. Apply an automatic action when photos expire.