Rename "stages" to "lessons" in i18n: Step 4

[Hamms]

Overall plan of attack:

1. Add all strings keyed by the term "stage" to crowdin under the key "lesson". (original: Rename "stages" to "lessons" in i18n: Step 1 #34854, second attempt: explicitly clone 'stage' strings to 'lessons' #35408)
2. Wait for a sync; Crowdin will automatically duplicate translations for the new strings (I18n sync Down & Out 06/22 #35426)
3. Update all I18n.t references currently using the key "stage" to use the new "lesson" translations (original: Rename "stages" to "lessons" in i18n: Step 3 #34878, second attempt: Revert "Revert "Rename "stages" to "lessons" in i18n: Step 3"" #35407)
4. Remove old "stage" strings now that they are no longer used (this PR)

Links

• spec
• jira

Testing story

Reviewer Checklist:

• Tests provide adequate coverage
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Pull Request is labeled appropriately
• Follow-up work items (including potential tech debt) are tracked and linked

[uponthesun]

There's a few more instances of stage: in scripts.en.yml, are those from something else? Do they matter?

Winters-MBP:code-dot-org winterdong$ grep -n "stage\:" dashboard/config/locales/scripts.en.yml
1538:          stage: {}
2742:          stage: {}
2747:          stage: {}
3924:          stage: {}
...

[uponthesun]

Want to get this stage variable as well?

[Hamms]

There's a few more instances of stage: in scripts.en.yml, are those from something else? Do they matter?

This change was to remove the plural key stages; I'm not sure where those keys are coming from, but I don't think they matter and they're definitely out of scope for this change.

[davidsbailey]

woohoo, glad to see these gone!