Feature: #84775 - Extend HMENU to support auto filling of special.value for special=language
See forge#84775
Description
This feature extends the 
        HMENU content object to support the auto filling of
        special. for language menus with the site languages available for the
current site. Setting 
        special. to 
        auto will include all available
languages from the current site.
In case of 
        special. the register 
        languages_ will be set
with the determined IDs for the further usage in TypoScript.
Changed options
- `special.value`
- 
            
    A list of comma separated language IDs (e.g. 0,1,2) or autoto load the list from site languages
Example TypoScript configuration
10 = HMENU
10 {
   special = language
   special.value = auto
}        
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