Add remaining strings for vector-im/riot-web#4151

src/components/views/dialogs/ChatInviteDialog.js

@@ -490,7 +490,7 @@ module.exports = React.createClass({
         var error;
         var addressSelector;
         if (this.state.error) {
-            error = <div className="mx_ChatInviteDialog_error">You have entered an invalid contact. Try using their Matrix ID or email address.</div>;
+            error = <div className="mx_ChatInviteDialog_error">{_t("You have entered an invalid contact. Try using their Matrix ID or email address.")}</div>;
         } else {
             const addressSelectorHeader = <div className="mx_ChatInviteDialog_addressSelectHeader">
                 Searching known users

src/components/views/dialogs/NeedToRegisterDialog.js

@@ -60,10 +60,10 @@ module.exports = React.createClass({
                 </div>
                 <div className="mx_Dialog_buttons">
                     <button className="mx_Dialog_primary" onClick={this.props.onFinished} autoFocus={true}>
-                        Cancel
+                        {_t("Cancel")}
                     </button>
                     <button onClick={this.onRegisterClicked}>
-                        Register
+                        {_t("Register")}
                     </button>
                 </div>
             </BaseDialog>

src/components/views/dialogs/QuestionDialog.js

@@ -51,7 +51,7 @@ export default React.createClass({
         const BaseDialog = sdk.getComponent('views.dialogs.BaseDialog');
         const cancelButton = this.props.hasCancelButton ? (
             <button onClick={this.onCancel}>
-                Cancel
+                {_t("Cancel")}
             </button>
         ) : null;
         return (