extra check before delete file

New languages:
* Polish (Polski [PL])
* Russian (Русский [RU])
* Traditional Chinese (中文 (繁體) [TW])

Bug fixed on PHP 7

New languages:
* Danish (Dansk [DK])
* Italian (Italiano [IT])
* Slovak (Slovensky [SK])

New languages:
* Catalan (Català [CA])
* Czech (Česky [CZ])
* German (Deutsch [DE])
* Spanish (Español [ES])
* French Canadian (Français [QC])
* French (Français [FR])
* Icelandic (Íslenska [IS])
* Norwegian (Norsk bokmål [NO])
* Dutch (Nederlands [NL])
* Portuguese Brazil (Brasil [BR])
* Swedish (Svenska [SE])
* Turkish (Türkçe [TR])

Ability to ask for a restore of missing files, if a multiple size is found in the cache. For example, if Piwigo finds the "XLarge" in the cache, it can be moved as the original file. For those who have no backup, it's much better than losing everything.

In addition to check filesystem files are listed in the database, check database files exist in the filesystem.

First revision