Automatically replace text value on SketchAPP, ideal for localization!. Just copy & paste the following script on Plugin->Custom Plugin

ChangeText.sketchplugin

//	Author: Victor Corvalan
var mkt01 = "#";
var mkt02 = "#";
var font_name = "";
var doc = context.document;
mkt01 = [doc askForUserInput:'Text to replace:' initialValue:''];
mkt02 = [doc askForUserInput:'New text value:' initialValue:''];
font_name = [doc askForUserInput:'Change FONT:' initialValue:''];
var layers;

for (var i = 0; i < doc.pages().count(); i++) {
	var page = doc.pages().objectAtIndex(i);
	layers = page.children();
	
	// Loop through all children of the page

	for (var j = 0; j < layers.count(); j++) {

		// get the current layer

		var layer = layers.objectAtIndex(j);

		// Check if the layer is a text layer

		if(layer.class() == "MSTextLayer") {
			if(layer.name().toLowerCase() == mkt01.toLowerCase()){
				layer.setName(mkt02);
				layer.setStringValue(mkt02);
				if(font_name != ""){
					layer.setFontPostscriptName(font_name);
				}
				refreshTextLayer(layer);
			}
		}
	}
}

function refreshTextLayer(layer) {
        [layer select: true byExpandingSelection: false];
        [layer setIsEditingText: true];
        [layer setIsEditingText: false];
        [layer select: false byExpandingSelection: false];
		[layer adjustFrameToFit];
    }