[i18n] Add locale to cache key - weblab

[elf-code]

Followup to #51846 because in prod, the translated instructions don't always show up.
Jira ticket - https://codedotorg.atlassian.net/browse/P20-164

Problem: After updating with #51846 , when I would view translated instructions they would sometimes load with the Spanish instructions and sometimes load with English instructions.

I noticed that ailab has the locale in their cache key so update weblab to do similar!

Testing story

I'm not confident that this will fix the issue, but I am confident that it can't hurt.

In development, we don't have caching on so every time you hit the database for the results for long instructions.

I changed that line to config.cache_store = :file_store, "/tmp/rails_cache/" and then could see cache files show up for the level (and language) I was requesting -

➜  ~ ls /tmp/rails_cache/5A2/6F1/levels%2F5314%2Fen-US%2Fnon_blockly_puzzle_level_options%2Fv2
/tmp/rails_cache/5A2/6F1/levels%2F5314%2Fen-US%2Fnon_blockly_puzzle_level_options%2Fv2
➜  ~ ls /tmp/rails_cache/FAE/810/lessons%2F3204%2Flesson_summary%2Fen-US%2Ftrue 
/tmp/rails_cache/FAE/810/lessons%2F3204%2Flesson_summary%2Fen-US%2Ftrue
➜  ~ ls /tmp/rails_cache/597/AB1/levels%2F5314%2Fes-ES%2Fnon_blockly_puzzle_level_options%2Fv2
/tmp/rails_cache/597/AB1/levels%2F5314%2Fes-ES%2Fnon_blockly_puzzle_level_options%2Fv2

Checklist

• Tests provide adequate coverage
• Privacy and Security impacts have been assessed
• 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

Also I'm not sure how my commit history has a Hamms commit in it, but I think it's already in staging

[elf-code]

These changes are only line-length changes within the comments at the top of the file (cause Dayne pointed me here but it was really hard to read the comment).

[nicklathe]

Makes sense to me,