sort actor and concept combobox values alphabetically

Currently with a longer vocabulary, user in edit form has to know what to start typing to get a suggestions. There has to be a way to see full list of vocabularies

• in minimal case (vocabulary specific) link to https://vocabs.sshopencloud.eu/vocabularies/en/ (or whatever they are published, e.g. TaDiRAH in https://vocabs.dariah.eu/tadirah/en/)
• or some listing of the whole vocabulary as listed by the API.

Ideas how to implement?

(notify: @klaus.illmayer , @lbarbot @matej.durco