Add reserved name list for properties, refs 2835

[mwjames]

This PR is made in reference to: #2835

This PR addresses or contains:

• Adds the smwgPropertyReservedNameList setting to list reserved names either as simple string or translatable representation using smw-property-reserved-...
• The creation isn't blocked and a reserved property can still be used but the following message will appear on the property page for a matchable name.

This PR includes:

• Tests (unit/integration)
• CI build passed

Fixes #

[mwjames]

@kghbln FYI

[kghbln]

Documented:

• Property naming
• $smwgPropertyReservedNameList / I documented as if one always has to add the name and the respective system message in pairs.

[mwjames]

I documented as if one always has to add the name and the respective system message in pairs.

Let me clarify:

"smw-property-reserved-category" is the message key that holds the warning message in namespace "MediaWiki", i.e. MediaWiki:Smw-property-reserved-category that is shown to the user if the reserved name "Category"

"smw-property-reserved-category" doesn't hold a warning message but a translatable name that is matched against the property name. For example, if the content language is ja then Category (as canonical form) is reserved but also カテゴリ since the name corresponds to a translated string in the content language.

So instead of listing all possible names in $smwgPropertyReservedNameList for any known language, smw-property-reserved-... is a "convention" key allowing us to use the translation system to help maintain a list.

The warning message that is displayed will be the same and is represented by smw-property-name-reserved.

[kghbln]

Ah, thanks for noting. This makes a lot of sense! Fluffed.