fix #249 header 2 (#425)

* Header updates
* More pixel alignment for nav
* Update unit test snapshots
I removed a stray `,` from `testHelpers.tsx` which changed the output of several snapshots.
* Fixes from PR review
* Forgot to update snapshots after merge with main
* Removed unused (and outdated) timeline page
* Updated some translation descriptions.

client/src/test/testHelpers.tsx

@@ -21,7 +21,7 @@ export const LocalizedComponent = ({children}: ILocalizedComponentProps) => {
         <IntlProvider locale={'en'}>
           {children}
         </IntlProvider>
-      </IntlContextProvider>,
+      </IntlContextProvider>
     </>
   );
 };