Remove Piwik support (#8835)

* Remove all mentions of Piwik

* Kill off all consumer of the old Piwik Analytics module

* Simplify ModalManager interface

* i18n

* Attempt to fix old e2e tests

* Remove unused component

* Iterate PR

src/components/views/right_panel/EncryptionPanel.tsx

@@ -84,7 +84,7 @@ const EncryptionPanel: React.FC<IProps> = (props: IProps) => {
     const changeHandler = useCallback(() => {
         // handle transitions -> cancelled for mismatches which fire a modal instead of showing a card
         if (request && request.cancelled && MISMATCHES.includes(request.cancellationCode)) {
-            Modal.createTrackedDialog("Verification failed", "insecure", ErrorDialog, {
+            Modal.createDialog(ErrorDialog, {
                 headerImage: require("../../../../res/img/e2e/warning.svg").default,
                 title: _t("Your messages are not secure"),
                 description: <div>