feat: script to filter and generate labels (with translations)

[raphodn]

What

Script to automatically :

• filter the taxonomy labels to keep only "organic" (the only one used currently)
• generate the language specific fields

Output

Total number of labels: 2896
Labels remaining: 1
Wrote to language files
old_labels 1
new_labels 1

148 json files in src/data/labels/<language-code>.json

Links that helped

• https://github.com/openfoodfacts/open-prices-frontend/pull/273
• https://github.com/openfoodfacts/openfoodfacts-python/blob/develop/openfoodfacts/taxonomy.py
• https://static.openfoodfacts.org/data/taxonomies/labels.full.json