Common reorg (#8025)

* Re-organize common folder

* fix: Correct paths in tests

* fix: move new content to proper folder

* chore: Move audio folder to assets

* Move sprites to sprites assets directory

* Move css sprites to assets directory

* Split out readmes for common code and sprites

* Move images to assets directory

* Move destinatin of shared browserified file

* remove unused file

* move compiled js to client-old

* Fix karma tests

* fix: Correct paths for sprites

website/common/script/i18n.js

@@ -0,0 +1,63 @@
+import _ from 'lodash';
+
+let i18n = {
+  strings: null,
+  translations: {},
+  t, // eslint-disable-line no-use-before-define
+};
+
+function t (stringName) {
+  let vars = arguments[1];
+  let locale;
+
+  if (_.isString(arguments[1])) {
+    vars = null;
+    locale = arguments[1];
+  } else if (arguments[2]) {
+    locale = arguments[2];
+  }
+
+  let i18nNotSetup = !i18n.strings && !i18n.translations[locale];
+
+  if (!locale || i18nNotSetup) {
+    locale = 'en';
+  }
+
+  let string;
+
+  if (i18n.strings) {
+    string = i18n.strings[stringName];
+  } else {
+    string = i18n.translations[locale] && i18n.translations[locale][stringName];
+  }
+
+  let clonedVars = _.clone(vars) || {};
+
+  clonedVars.locale = locale;
+
+  if (string) {
+    try {
+      return _.template(string)(clonedVars);
+    } catch (_error) {
+      return 'Error processing the string. Please see Help > Report a Bug.';
+    }
+  } else {
+    let stringNotFound;
+
+    if (i18n.strings) {
+      stringNotFound = i18n.strings.stringNotFound;
+    } else if (i18n.translations[locale]) {
+      stringNotFound = i18n.translations[locale] && i18n.translations[locale].stringNotFound;
+    }
+
+    try {
+      return _.template(stringNotFound)({
+        string: stringName,
+      });
+    } catch (_error) {
+      return 'Error processing the string. Please see Help > Report a Bug.';
+    }
+  }
+}
+
+module.exports = i18n;