HelpHub: Correct post type and taxonomy labels

[SergeyBiryukov]

In the HelpHub plugin, post type and taxonomy labels are structured like this:

• Add New %s
• Edit %s
• No %s Found
• ...

Same for messages hooked to the post_updated_messages filter:

• %3$s updated. %1$sView %4$s%2$s
• %s updated.
• %1$s draft updated. %3$sPreview %2$s%4$s
• ...

Same for taxonomies:

• Search %s
• All %s
• New %s Name
• ...

This is simply not translatable and defeats the purpose of having post type and taxonomy labels in the first place.

In languages other than English, just inserting a post type name into a generic string like Edit %s or %s updated does not work as expected, hence the need for a full array of various labels.

A general best practice in WordPress is to avoid post type and taxonomy names in generic strings due to i18n concerns and structural differences in languages. See ​#WP37895 for example.

This should be replaced with an array of proper labels:

• Add New Article
• Edit Article
• No Articles Found
• ...
• Add New WordPress Version
• Edit WordPress Version
• No WordPress Versions Found
• ...