Problem/Motivation
i18ntaxonomy sub module adds two fields to the {term_data} that take care about the translations, we need to create the term entities using the new entity API.
Proposed resolution
We need to create a custom source plugin that takes into account these new fields in {term_data} and also the i18nstrings module features so we can use the new column trid for the migration.
Original report by Ryan Weal
Like nodes, taxonomies can use entity translation. Notes above in nodes should apply.
Note: this issue deals with taxonomy vocabularies. https://www.drupal.org/node/2784371 deals with taxonomy terms.