Convert all letters to upper case to compare.
BUG: 362193 Since special characters for each language in khangman language.txt files are lower case, but we show upper case in the gui special characters were not properly getting marked as disabled or being marked green or red when clicked. To fix always compare upper case version of letters. Note: if I changed letter button letter property to modelData.toUpperCase some German characters were shown incorrectly in the gui, so show the modelData with capitalization font, but compare toUpperCase() behind the scenes.
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