Lead a PT9 import with its most-glossed language (#338)

[alex-rawlings-yyc]

Closes #338.

Summary

• A PT9 import listed its gloss languages in the order their files were found, but the view shows glosses in the first language only. In Pimbwe, en comes first but covers only LUK, so nearly every gloss showed blank. The languages are now sorted by how many tokens each one glosses, with ties kept in file order. The view and Copy to editable both use the first language, so both now get the main one.
• InterlinearProject.analysisLanguages now says the first tag is the language glosses are shown and edited in.

Existing imports pick up the new order the next time they sync.

Out of scope: the import prompt still doesn't say the import opens read-only. A word with no imported gloss still has no gloss field until the import is copied to an editable project.

Test plan

• Unit tests: a language that glosses more tokens but is listed later comes first, a language whose books converted nothing goes last, and tied languages keep file order; 100% coverage
• Re-sync Pimbwe: languages are swh, en, English, and 96.6% of approved tokens have a Swahili gloss
• Open Pimbwe, accept the import offer, then Open: Swahili glosses show in PHP, ROM and LUK

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[rdeblois1960]

Not sure what to say. My problem was resolved by closing the interlinear window and reopening it. I cannot reproduce it again.

[alex-rawlings-yyc]

@rdeblois1960 No worries. Let us know if it does come up again