Enhance DecomposeUnicodeForMatch: Add German support an a non-case-changing version

[haraldharders]

DecomposeUnicodeForMatch removes diacritics and changes the case to lower case which is in deed useful for comparing strings.

I have two proposals:

Add support for German and other languages

In German language, umlauts are replaced by the character + an "e" rather than just removing the dots, i.e., "ä" → "ae", "ö" → "oe", etc. And, the sharp s (sz ligature) is replaced by "ss": "ß" → "ss". Both replacements are not being done by DecomposeUnicodeForMatch.

Proposal: Add an optional argument:

DecomposeUnicodeForMatch([String], [Language] = "default")

if [Language] = "default" or omitted, standard behaviour is selected.

if [Language] = "de" or "German", replacements "ä" → "ae", "ö" → "oe", "ß" → "ss" etc. are applied

Other new replacements would be good, e.g. for "Œ", "œ", "Ø", "ø", "Æ", "æ", e.g., for Danish or French. Native speakers should advice the correct replacements.

Switch off case change

A second optional argument could be added to switch off the case change and to preserve uppercase characters:

DecomposeUnicodeForMatch([String], [Language] = "default", [Preserve Case] = 0)