replace deprecated ft_backlinks() in Ui

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Fix groups match in auth_ismanager and auth_isadmin

Even if a user was passed to the check but no groups, current user's groups were used for the match

Remove strings and files not yet translated

Minor optimization of clientIP()

Remove unnecessary assignment, check the output of filter_var() directly.

Initial batch of Minnan localization

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Restrictive Content-Security-Policy for media #1045

This adds a CSP header for all media delivered through our fetch.php
dispatcher. This should revent any scripts etc. to be executed when
scriptabl

Restrictive Content-Security-Policy for media #1045

This adds a CSP header for all media delivered through our fetch.php
dispatcher. This should revent any scripts etc. to be executed when
scriptable media, like SVG is used.

Suggestions on finetuning the policy are welcome.

The policy is added to the MEDIA_SENDFILE event, so plugins can easily
influence it. The way it is passed as an array should make it easier to
modify from plugins as well.

I put the mechanism to send the header into it's own class in the HTTP
namespace. Additional methods from inc/httputils could be moved here
later. The method might also be interesting for #2198 and #1676.

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replace deprecated function calls #3266

Fix proper param order and use main function name instead of alias 'join'.

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