Fix copy bugs and update en.json for spanish translators (#746)

* update copy bugs

- updates snapshots

* Update intl en.json

- remove duplicate ids

client/src/pages/__snapshots__/index.test.tsx.snap

@@ -375,7 +375,7 @@ exports[`rendering of the DatasetContainer checks if various text fields are vis
                     rel="noreferrer"
                     target="_blank"
                   >
-                    Executive Order 14008 on Tackling the Climate Crisis at Home and Abroad
+                    Executive Order 14008 on Tackling the Climate Crisis at Home and Abroad.
                   </a>
                 </p>
               </div>
@@ -508,7 +508,7 @@ exports[`rendering of the DatasetContainer checks if various text fields are vis
       data-testid="gridContainer"
     >
       <h2>
-        How to get started
+        Get involved
       </h2>
       <div
         class="grid-row grid-gap-lg j40-aboutcard-container "
@@ -581,7 +581,7 @@ exports[`rendering of the DatasetContainer checks if various text fields are vis
               data-testid="grid"
             >
               <img
-                alt="Send feedback"
+                alt="Join the open source community"
                 class="j40-aboutcard-image"
                 src="test-file-stub"
               />
@@ -595,7 +595,7 @@ exports[`rendering of the DatasetContainer checks if various text fields are vis
                 data-testid="grid"
               >
                 <h3>
-                  Send feedback
+                  Join the open source community
                 </h3>
                 <p>
                   The screening tool’s code is open source, which means it is  available for the public to view and contribute to. Anyone can view and contribute on GitHub.

client/src/pages/__snapshots__/methodology.test.tsx.snap

@@ -450,7 +450,7 @@ exports[`rendering of the DatasetContainer checks if various text fields are vis
               Poverty
             </h3>
             <div>
-              Percent of a block group's population in households where the household income is at or below 100% of the federal poverty level
+              Percent of a block group's population in households where the household income is at or below 100% of the federal poverty level.
             </div>
             <ul>
               <li>

client/src/pages/index.tsx

@@ -133,7 +133,7 @@ const IndexPage = ({location}: IndexPageProps) => {
           <AboutCard
             size={'small'}
             imgSrc={githubIcon}
-            header={intl.formatMessage(ABOUT_COPY.GET_INVOLVED.SEND_FEEDBACK_HEADING)}
+            header={intl.formatMessage(ABOUT_COPY.GET_INVOLVED.JOIN_OSC_HEADING)}
             linkText={intl.formatMessage(ABOUT_COPY.GET_INVOLVED.JOIN_OSC_LINK_TEXT)}
             url={ABOUT_COPY.GITHUB_LINK}
             openUrlNewTab={true}