Tooltip texts for key actions

src/util/index.ts

@@ -0,0 +1,10 @@
+// Source: http://stackoverflow.com/questions/13720256/javascript-regex-camelcase-to-sentence
+export function camelCaseToSentence(camelCasedText: string): string {
+    return camelCasedText.replace(/^[a-z]|[A-Z]/g, function (v, i) {
+        return i === 0 ? v.toUpperCase() : ' ' + v.toLowerCase();
+    });
+}
+
+export function capitalizeFirstLetter(text: string): string {
+    return text.charAt(0).toUpperCase() + text.slice(1);
+}