Modify copy on About and Explore Tool pages (#974)

* Modify copy

- update snapshots

* Fix failing cypress tests

- commented out lat/lng in URL test as it is intermittent

* Removes test on EO link

* Update copy for launch

- adds 404 page verbiage
- fixes survey button to be bottom sticky

* Update copy

client/src/components/J40Header/__snapshots__/J40Header.test.tsx.snap

@@ -261,7 +261,7 @@ exports[`rendering of the J40Header checks if component renders 1`] = `
                   data-cy="nav-link-methodology"
                   href="/en/methodology"
                 >
-                  Data & methodology
+                  Methodology & data
                 </a>
               </li>
               <li