Search and retrieval with accents (diacritic)

Currently, when you conduct a search the International Spanish Edition in the SNOMED International Browser using the diacritic (accent), it retrieves only terms without accents. When you conduct the search with an accent, it retrieved BOTH terms with and without accent. 

In Snowstorm we have configuration to change how accented characters are handled. This is configured per language because each language seems to have different requirements. We have found that in some languages some accented/diacritic characters are considered as completely different characters and are included separately in the alphabet of that language. Whereas other accented characters do not appear separately in the alphabet and are just considered as modified versions of the original character.

This separation is important when it comes to search. For example in Sweden they consider characters 'å', 'ä' and 'ö' as unique characters which should never be simplified to 'a' or 'o' for search. This simplification is called character folding. In the latest Snowstorm release by default we are not folding/simplifying the characters: áéíóúüñ.
This means that these exact characters have to be used in the search term in order to match descriptions with those characters.

Questions for the SNOMED CT Spanish User Support Group: 

1 - Is it okay to have the search conducted with or without accents and able to retrieve terms with or without accent across-Spanish dialects? Or would this need to be specific for each Spanish Extension shown on the SNOMED Browser?  

2 - What characters should be and/or should NOT be folded/simplified? 

3 - If you believe this needs a meeting/discussion please let me know. 

If you could please leave comments below by Friday, April 23, 2021 so we can move ahead on this fix (if agreed by all). Thank you in advance for your help! 

Corresponds to ticket: https://projects.jira.snomed.org/browse/BROWSE-415