Fix New UX related bugs for Alerts, BucketList and Abort Upload modal (#5694)

- Center text on Alert component appearing on top
- Change "Upload" to "Continue" on New UX Abort Upload modal
- Fix issue where long bucket names were overflowing instead of
continuing on the next line
- Fix word wrap issue similar to the last one for the alerts that appear
on top
- Help fix the cluttering issue on #5690 as the right margin has been
increased in alerts

Fixes #5689, #5691 and #5695

browser/app/js/uploads/AbortConfirmModal.js

@@ -50,7 +50,7 @@ export class AbortConfirmModal extends React.Component {
         sub="This cannot be undone!"
         okText="Abort"
         okIcon={okIcon}
-        cancelText="Upload"
+        cancelText="Continue"
         cancelIcon={cancelIcon}
         okHandler={this.abortUploads.bind(this)}
         cancelHandler={hideAbort}