Accept language on 2 or 5 chars

[j0k3r]

Accept en, fr, etc.. but also de-DE, en-US, etc.
Also replace dead image in tests by a real image.
And use Regex to validate the language

Related:

• Fix epub language wallabag#5647
• generated epub with wrong metadata wallabag#5596

[Kdecherf]

You could replace mb_strlen calls with this regex:

preg_match('/^((?<language>([A-Za-z]{2,3}(-(?<extlang>[A-Za-z]{3}(-[A-Za-z]{3}){0,2}))?)|[A-Za-z]{4}|[A-Za-z]{5,8})(-(?<region>[A-Za-z]{2}|[0-9]{3}))?)$/', $language);

It is incomplete but should work for almost all cases.

References:

• https://github.com/sebinsua/ietf-language-tag-regex/blob/master/index.js
• https://schneegans.de/lv/#regex

[j0k3r]

@Kdecherf I'm not sure about the regex, fr is not allowed: https://3v4l.org/aq5Gl

[Kdecherf]

@j0k3r hm the results I see on your snippet are expected

[j0k3r]

Hmm does the comparison in my last commit is ok then?

[Kdecherf]

The regex in last commit looks good, I let you squash before merging