Replace R.string.yes with R.string.ok

Android doesn't use yes/no but ok/cancel usually, so this should be done here, too

app/src/main/res/values-ja/strings.xml

@@ -87,7 +87,6 @@
     <string name="short_thousand">k</string>
     <string name="short_million">M</string>
     <string name="short_billion">B</string>
-    <string name="yes">はい</string>
     <string name="open_in_popup_mode">ポップアップモードで開く</string>
     <string name="msg_popup_permission">ポップアップモードで開くには
 \n権限の許可が必要です</string>