How to use the scratch-blocks.ScratchMsgs function in scratch-blocks

ScratchBlocks.Blocks.sensing_touchingobjectmenu.init = function () {
        const mouse = ScratchBlocks.ScratchMsgs.translate('SENSING_TOUCHINGOBJECT_POINTER', 'mouse-pointer');
        const edge = ScratchBlocks.ScratchMsgs.translate('SENSING_TOUCHINGOBJECT_EDGE', 'edge');
        const json = jsonForMenuBlock('TOUCHINGOBJECTMENU', spriteMenu, sensingColors, [
            [mouse, '_mouse_'],
            [edge, '_edge_']
        ]);
        this.jsonInit(json);
    };

ScratchBlocks.Blocks.sensing_of_object_menu.init = function () {
        const stage = ScratchBlocks.ScratchMsgs.translate('SENSING_OF_STAGE', 'Stage');
        const json = jsonForMenuBlock('OBJECT', spriteMenu, sensingColors, [
            [stage, '_stage_']
        ]);
        this.jsonInit(json);
    };

const motion = function (isStage, targetId) {
    const stageSelected = ScratchBlocks.ScratchMsgs.translate(
        'MOTION_STAGE_SELECTED',
        'Stage selected: no motion blocks'
    );
    return `
    
        ${isStage ? `
        <label></label>
        ` : `
        
            
                <shadow type="math_number">
                    10
                </shadow>
            
        

const operators = function () {
    const apple = ScratchBlocks.ScratchMsgs.translate('OPERATORS_JOIN_APPLE', 'apple');
    const banana = ScratchBlocks.ScratchMsgs.translate('OPERATORS_JOIN_BANANA', 'banana');
    const letter = ScratchBlocks.ScratchMsgs.translate('OPERATORS_LETTEROF_APPLE', 'a');
    return `
    
        
            
                <shadow type="math_number">
                    
                </shadow>
            
            
                <shadow type="math_number">
                    
                </shadow>