fix-1703

[hon2a]

Fixed Translator to supply correct defaults for plural forms (if supplied) to saveMissing. (Fixes #1703 .)

Checklist

• only relevant code is changed (make a diff before you submit the PR)
• run tests npm run test
• tests are included (or rather the existing test is modified)

[hon2a]

The failed CodeClimate check has nothing to do with this patch (it's on unchanged code).

[coveralls]

Coverage increased (+0.006%) to 90.884% when pulling f06c571 on hon2a:hon2a/missing-defaults-plural into 34c5efd on i18next:master.