support disambiguators for definitions

[dwhieb]

Many definitions often need disambiguators in cases where a word in the analysis language is ambiguous. For example, the definition of hoku in Chitimacha is 'mortar', referring to the grinding tool (ex. mortar and pestle) rather than the weapon or filling material in masonry.

The disambiguator would be a MultiLangString containing a brief string to be shown before the definition.

definition: "mortar"
disambiguator: "grinding tool"
displayed by an implementation: [grinding tool] mortar