Replaced utf8 character that broke latex compilation of the manual

doc/language.doc

@@ -173,7 +173,7 @@ when the translator was updated.
   </tr>
   <tr bgcolor="#ffffff">
     <td>Japanese</td>
-    <td>Hiroki Iseri<br/>Ryūnosuke Satoh<br/>Kenji Nagamatsu<br/>Iwasa Kazmi</td>
+    <td>Hiroki Iseri<br/>Ryunosuke Satoh<br/>Kenji Nagamatsu<br/>Iwasa Kazmi</td>
     <td>goyoki at gmail dot com<br/>sun594 at hotmail dot com<br/>naga at joyful dot club dot ne dot jp<br/><span style="color: brown">[unreachable]</span></td>
     <td>1.6.0</td>
   </tr>
@@ -371,7 +371,7 @@ when the translator was updated.
   ~ & Ahmed Aldo Faisal & {\tt\tiny aaf23 at cam dot ac dot uk} & ~ \\
   \hline
   Japanese & Hiroki Iseri & {\tt\tiny goyoki at gmail dot com} & 1.6.0 \\
-  ~ & Ryūnosuke Satoh & {\tt\tiny sun594 at hotmail dot com} & ~ \\
+  ~ & Ryunosuke Satoh & {\tt\tiny sun594 at hotmail dot com} & ~ \\
   ~ & Kenji Nagamatsu & {\tt\tiny naga at joyful dot club dot ne dot jp} & ~ \\
   ~ & Iwasa Kazmi & {\tt\tiny [unreachable] iwasa at cosmo-system dot jp} & ~ \\
   \hline

doc/maintainers.txt

@@ -86,7 +86,7 @@ Ahmed Aldo Faisal: aaf23 at cam dot ac dot uk
 
 TranslatorJapanese
 Hiroki Iseri: goyoki at gmail dot com
-Ryūnosuke Satoh: sun594 at hotmail dot com
+Ryunosuke Satoh: sun594 at hotmail dot com
 Kenji Nagamatsu: naga at joyful dot club dot ne dot jp
 Iwasa Kazmi: [unreachable] iwasa at cosmo-system dot jp