This is postponed on #3112249: [backport] Migrate d7 menu translation.
Problem/Motivation
Menu links in Drupal 7 are translated using i18n_menu submodule of the suite i18n, we need to migrate those respecting the language settings. This should be similar to the D6 version, #2225587: Migrate D6 i18n menu links
The D6 patch included a migration for language content menu settings as well. For D7 that was done in a separate issue, #3110669: [backport] Migrate d7 menu language content settings.
Proposed resolution
Ensure that the menu_links migration sets a default value for the langcode. From #3013625: Menu language not properly migrated from D7 localized menu links..
Add two migrations one for localized menu links, d7_menu_links_localized, and another one for translations that are not localized, d7_menu_links_translation.
This migration should also set the state of the menu_links migration to finished.
Remaining tasks
Write a patch
Review
Commit