Apply `translation:sync` to `yaml` Files and Remove Unused `locale/` + `locales/` Files

[aaronskiba]

Changes proposed in this PR:

• Update locales/ files (7c2cf881d91d165aeff7b4aa2a499383171d8885)

  • We have config.disable_yaml = true set in config/initializers/translation.rb
  • To enable the changes in this commit, we had to set config.disable_yaml = false and then execute bundle exec rake translation:sync with the prod key
  • In addition, due to https://github.com/portagenetwork/roadmap/issues/933, we also temporarily lowered the version of the psych gem (a4e5dca73831ef5627227faf3698e9578206e878, ea71a224237fdd39491a1481d803a924cb60e6be)

• Remove unused locale/ and locales/ files (bae62e9ed54e0f4b14ae3655e2b61c18529a69e3 and f600ba084b741dba0acc484224d4017f0a5b4bae)

  • Because I18n.available_locales == [:"en-CA", :"fr-CA"] for DMP Assistant, we removed all non-en, en-CA, and fr-CA .yml files.

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