"Inherits from" shown even when not inheriting, not translatable.

Problem/Motivation

On the metatag default value configuration screen, the text "Inherits meta tags from: [base]" is shown in each group.

• For global defaults, which do not inherit, the text is shown as "Inherits meta tags from:" without further info.
• The string is not translatable.

Proposed resolution

Do no show the text when not inheriting from another set. Run string through t() for translation support.

Remaining tasks

Review and apply patch.

User interface changes

Inheritance info is only shown when applicable, interface text becomes translatable.

API changes

None

Data model changes

None