def check_box_toggled(self):
        self.locale = self.qm_files_choices[self.sender()]
Loop through lines and find, set, and remove footnote definitions.
dataset/ETHPy150Open aroberge/easygui_qt/easygui_qt/language_selector.py/LanguageSelector.check_box_toggled--crossover with--dataset/ETHPy150Open darcyliu/storyboard/markdown/extensions/footnotes.py/FootnotePreprocessor.run