ACalc: Update _locales/en/messages.json: Speech label for plus is "plus", not "+"
ACalc: Update _locales/en/messages.json: Speech label for plus is "plus", not "+"

osric-the-knight/foam,jacksonic/foam,mdittmer/foam,jlhughes/foam,foam-framework/foam,jlhughes/foam,mdittmer/foam,jacksonic/foam,mdittmer/foam,mdittmer/foam,jacksonic/foam,jlhughes/foam,jacksonic/foam,foam-framework/foam,jlhughes/foam,osric-the-knight/foam,osric-the-knight/foam,foam-framework/foam,foam-framework/foam,osric-the-knight/foam,foam-framework/foam