Add external modules to validations

modules/index.js

@@ -5,6 +5,7 @@ import * as modes from './modes/index';
 import * as util from './util/index';
 import * as operations from './operations/index';
 import * as presets from './presets/index';
+import * as validations from './validations/index';
 
 export { Connection } from './core/connection';
 export { Difference } from './core/difference';
@@ -24,5 +25,6 @@ export {
   modes,
   operations,
   presets,
-  util
+  util,
+  validations
 };

modules/validations/deprecated_tag.js

@@ -1,3 +1,4 @@
+import { tagText } from '../util/index';
 export function DeprecatedTag() {
 
     var validation = function(changes) {
@@ -7,7 +8,7 @@ export function DeprecatedTag() {
                 deprecatedTags = change.deprecatedTags();
 
             if (!_.isEmpty(deprecatedTags)) {
-                var tags = iD.util.tagText({ tags: deprecatedTags });
+                var tags = tagText({ tags: deprecatedTags });
                 warnings.push({
                     id: 'deprecated_tags',
                     message: t('validations.deprecated_tags', { tags: tags }),