Tiny fixes (#1437)

Author: tooomm

frontend/src/lobby/JoinPanel.jsx

@@ -30,7 +30,7 @@ const JoinPanel = ({roomInfo}) => {
             </tr>)}
           </tbody>
         </table>
-        : "There are no rooms currently open."}
+        : "There are no public rooms open currently."}
     </fieldset>
   );
 };

frontend/src/lobby/Version.jsx

@@ -21,7 +21,7 @@ const Version = ({version, MTGJSONVersion, boosterRulesVersion}) => {
 
       <div>
         Card data: <a href="https://www.mtgjson.com">MTGJSON</a> {" "}
-        <a href={`https://mtgjson.com/changelog/version-5/#_${MTGJSONVersion.version.replace(/\./g, "-")}`} className='code'>
+        <a href={`https://mtgjson.com/changelog/mtgjson-v5/#_${MTGJSONVersion.version.replace(/\./g, "-")}`} className='code'>
           <code>v{MTGJSONVersion.version}</code>
         </a> <span className='date'>({MTGJSONVersion.date})</span>
       </div>

frontend/src/lobby/Version.scss

@@ -5,6 +5,7 @@
   display: grid;
   grid-auto-flow: column;
   grid-gap: 20px;
+  text-align: center;
   align-content: end;
 
   a {