Polyols are called "Sugar alcohol", at least in the USA

[CharlesNepote]

Describe the bug

I have searched for 10 random products sold in the US with polyols + a nutrition table image: for all these products, polyols were called "Sugar alcohol" on the nutrition table. So I guess "Sugar alcohol" is the main name used in the USA.

People entering data will try to type "sugar alcohol" in the "Add nutrient" field but won't find anything relevant.

In the UK, the word seems to be "polyols". Eg. https://world.openfoodfacts.org/cgi/product.pl?type=edit&code=0634158794032#nutrition

To Reproduce

Examples:

• https://world.openfoodfacts.org/cgi/product.pl?type=edit&code=0034000141418#nutrition
• https://world.openfoodfacts.org/cgi/product.pl?type=edit&code=0602652271380#nutrition
• https://world.openfoodfacts.org/cgi/product.pl?type=edit&code=0842379149146#nutrition
• https://world.openfoodfacts.org/cgi/product.pl?type=edit&code=0843076000051#nutrition

Expected behavior

People entering "sugar alcohol" in the "Add a nutrient" field should see "Polyols (sugar alcohol)" or something like this.

In fact, all sugar alcohols are polyols: "Since they contain multiple –OH groups, they are classified as polyols." (source: Sugar alcohol wikipedia page).
Not all polyols seem to be sugar alcohols, but the ones used in the food industry probably are.

In Open Food Facts we might use either:

• "Sugar alcohols (polyols)"
• or "Polyols (Sugar alcohols"

Part of

• 🇺🇸 Improve support for the United States (tracker) #5689

[aleene]

I'll make a pull request.

[CharlesNepote]

Your PR is live now, thanks a lot @aleene.