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Merge pull request #2577 from chang-zhao/patch-5

Add links "plugins" & "templates" to intro_search.txt

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translation update for zh:extensions, revert "offline" to "manual"

translation update for zh:extensions, closes #2572

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adjust bundled plugins that check for admin permissions

This adjusts the bundled plugins to do their admin permission checks
based on their admin component's isAccessibleByCurrentUser() method
inste

adjust bundled plugins that check for admin permissions

This adjusts the bundled plugins to do their admin permission checks
based on their admin component's isAccessibleByCurrentUser() method
instead of doing their own isAdmin checks.

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add reerence to the actual plugin to ADMINPLUGIN_ACCESS_CHECK

Otherwise it's a bit ahrd to decide if access should be granted ;-)

add event to check access to admin plugins

This adds a new method that capsulates the access check that has to be
done to decide if an admin plugin's page should be shown to the user.
The default im

add event to check access to admin plugins

This adds a new method that capsulates the access check that has to be
done to decide if an admin plugin's page should be shown to the user.
The default implementation is the same as before, relying only on the
forAdminOnly() method and the users' isadmin or ismanager status.

Admin plugins themselves can override the method to do additional
checks. In this patch, I added that to the usermanager plugin which will
only return true if the current auth backend can list users.

However the real idea behind this change is that the new method emits a
new event called ADMINPLUGIN_ACCESS_CHECK which would allow plugins to
overwrite it. This way it could be possible to give certain user groups
access to certain admin plugins without giving them admin or manager
permissions.

Note: this does not change how the "Admin" link is shown, it still
depends on ismanager or isadmin. A plugin as mentioned above would need
to influence the display via the MENU_ITEMS_ASSEMBLY event.

Note: this only covers the basic access check. Admin plugins may need
further adjustments for access to other parts of the plugin (like AJAX
components). An additional commit will update this for the bundled
plugins.

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unify send_redirect(wl()) parameters
- always use absolute URL
- use static string instead of array if no concat is required
- use '&' instead of '&'

extension: set User-Agent header to 'DokuWiki HTTP Client (Extension Manager)'

This solves problems with project hosters which do not start an download immediately
if the User-Agent seems to be a br

extension: set User-Agent header to 'DokuWiki HTTP Client (Extension Manager)'

This solves problems with project hosters which do not start an download immediately
if the User-Agent seems to be a browser, also see #2410.

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