Ä° and Ä« not detected as mojibake

[robstradling]

Hi @rspeer. Many thanks for creating and maintaining FTFY! We're using it at Sectigo to help prevent mojibake from finding its way into string fields in the digital certificates that we issue. We've noticed a couple of mojibake sequences that FTFY doesn't currently detect and fix:

Desired behaviour:

$ echo "Ä°stanbul" | iconv -t WINDOWS-1252
İstanbul
$ echo "RÄ«ga" | iconv -t WINDOWS-1252
Rīga

Current FTFY behaviour:

$ echo "Ä°stanbul" | ftfy
Ä°stanbul
$ echo "RÄ«ga" | ftfy
RÄ«ga

Would it be possible to make FTFY handle these cases?