docs: add CatSouta as a contributor for translation (#840)

Adds @CatSouta as a contributor for translation.

This was requested by Cryotechnic [in this
comment](#835 (comment))

[skip ci]

Author: Cryotechnic

.all-contributorsrc

@@ -215,6 +215,15 @@
       "contributions": [
         "translation"
       ]
+    },
+    {
+      "login": "CatSouta",
+      "name": "Souta",
+      "avatar_url": "https://avatars.githubusercontent.com/u/18072048?v=4",
+      "profile": "https://souta.cc",
+      "contributions": [
+        "translation"
+      ]
     }
   ],
   "repoType": "github"

README.md

@@ -160,6 +160,9 @@ Made by all captains around the world with ❤️. Fight for all that is beautif
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/IhoFox"><img src="https://avatars.githubusercontent.com/u/133899447?v=4?s=100" width="100px;" alt="IhoFox"/><br /><sub><b>IhoFox</b></sub></a><br /><a href="#translation-IhoFox" title="Translation">🌍</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/kujou-kju"><img src="https://avatars.githubusercontent.com/u/23724383?v=4?s=100" width="100px;" alt="kujou"/><br /><sub><b>kujou</b></sub></a><br /><a href="#translation-kujou-kju" title="Translation">🌍</a></td>
     </tr>
+    <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://souta.cc"><img src="https://avatars.githubusercontent.com/u/18072048?v=4?s=100" width="100px;" alt="Souta"/><br /><sub><b>Souta</b></sub></a><br /><a href="#translation-CatSouta" title="Translation">🌍</a></td>
+    </tr>
   </tbody>
 </table>