Make Vocab available in Api Controllers on the server

[Brian Lewis]

Vocab translation is almost always handled on the client, but there are some situations - notably generating a name for a downloaded Excel Workbook where it is useful to be able to access a translation; e.g. of ‘District’

[Brian Lewis]

Will be handled using EntityFramework, since Factory.Context exposes the EF context (through Dependency Injection)

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[Brian Lewis]

feat(data): add Vocab to EF context and support vocab lookups on server.

Resolves #1394

→ <<cset ebd710d2dd33>>

[Brian Lewis]

feat(exceloutput): improved generation of workbook names, including Vocab, sanitised filenames to handle vocab entries containing /

Resolves #1394

→ <<cset 7b3bef2af97e>>