Adding support for sub languages on the "backend"

[Mathys-Gasnier]

Description

Add the ability to parse sub languages to the snippet parser, and to consolidate them.

To consolidate them we save the json and svg with the following name format language--subLanguage.
I didn't want to put them under folders as i think it would complexify things in the frontend.
Also, as we are using slugify to generate the language and subLanguage name, a -- can never occur outside of that usecase.

As it stands we support only 1 level of nesting languages.

Some small changes also include renaming some names key to name (lang in _index.json and categoryName)

Type of Change

• ✨ New snippet
• 🛠 Improvement to an existing snippet
• 🐞 Bug fix
• 📖 Documentation update
• 🔧 Other (please describe): Consolidation script update to start adding support to sub languages

Checklist

• I have tested my code and verified it works as expected.
• My code follows the style and contribution guidelines of this project.
• Comments are added where necessary for clarity.
• Documentation has been updated (if applicable).
• There are no new warnings or errors from my changes.

Related Issues

Related to #136

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[Mathys-Gasnier]

The preview doesn't work because the consolidation hasn't run, i'm going to push a commit manually doing it