Added alt text for information icon.

data/core.yaml

@@ -1,4 +1,6 @@
 en:
+  icons:
+    information: info
   modes:
     add_area:
       title: Area

dist/locales/en.json

@@ -1,5 +1,8 @@
 {
     "en": {
+        "icons": {
+            "information": "info"
+        },
         "modes": {
             "add_area": {
                 "title": "Area",

modules/ui/tag_reference.js

@@ -157,6 +157,7 @@ export function uiTagReference(tag) {
         _button = _button.enter()
             .append('button')
             .attr('class', 'tag-reference-button')
+            .attr('title', t('icons.information'))
             .attr('tabindex', -1)
             .call(svgIcon('#icon-inspect'))
             .merge(_button);