CSpell: Add other locale dictionaries

### Summary
Raised off the back of [I18n Stories PR](https://github.com/mi6/ic-ui-kit/pull/4087)

It was suggested that we use [CSpell's locale feature](https://cspell.org/docs/Configuration/language-settings) so that we wouldn't need to add individual words in other languages.

### 💬 Description
1. Configure our cspell.json so that we can remove the exceptional "words" in french, german, etc. (e.g. 'boissons')

### 💰 Use value
Would allow us to keep our cspell configuration a little slimmer.

I skimmed a Medium blog that suggested [a more nuanced approach to multilingual spellchecking in cspell](https://medium.com/@anticultist/setting-up-a-spell-checker-for-vs-code-8086462fce66#:~:text=the%20configuration%20confusing.-,Multilingual%20Configuration,-It%20is%20common) that could be worth reading

### 🚨 Urgency (low, medium or high)
Low

### Additional info
Tell us anything else useful to help us understand your suggestion.

Start with cspell.json and review CSpell's locale feature documentation, along with the referenced I18n Stories PR for the current multilingual words. Configure the supported locales, remove only the now-unnecessary exceptional words such as 'boissons', and verify that spellchecking still handles the existing language content.

Written by the indexing model from the issue text.