Error: Recommendation request is invalid: ["/topics/0/language: must match pattern \"^[a-z]{2,3}(?:-[a-zA-Z]+)?$\""]

[sentry]

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Observed behavior

The recommendation API embed_topics_request schema does not allow language codes like zh-Hans-CN which exist in our ecosystem.

Sentry Issue: STUDIO-J62

Error: Recommendation request is invalid: ["/topics/0/language: must match pattern \"^[a-z]{2,3}(?:-[a-zA-Z]+)?$\""]
  at SearchOrBrowseWindowvue_type_script_lang_js.computed.shouldShowRecommendations (channelEdit/views/ImportFromChannels/SearchOrBrowseWindow.vue:442:1)
  at <object>.scopedSlots.fn (./channelEdit/views/ImportFromChannels/SearchOrBrowseWindow.vue:1:555)
  at render (./channelEdit/views/ImportFromChannels/ImportFromChannelsModal.vue:1:1325)
...
(10 additional frame(s) were not displayed)

Expected behavior

The schema should validate against every language code in https://github.com/learningequality/le-utils/blob/main/le_utils/resources/languagelookup.json

A test should be written to verify this.