Thread:Support/About iNaturalist:I18n.inflections.:@vow or con.o/en

Documentation needed.

Same here:
 * iNaturalist:I18n.inflections.:@vow or con.u/en
 * iNaturalist:I18n.inflections.:@vow or con.default/en
 * iNaturalist:I18n.inflections.:@vow or con.a/en
 * iNaturalist:I18n.inflections.:@vow or con.e/en
 * iNaturalist:People added.comment.with by/en
 * iNaturalist:People added.comment.without by/en
 * iNaturalist:I18n.inflections.:@vow or con.i/en

It seems that 'vow' is a contraction of vowal and 'con' is of consonant. Should we translate 'vow' and 'con'?