Hide debug button when not in debug mode

.idea/misc.xml

@@ -25,7 +25,7 @@
       </value>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

app/src/main/java/eu/faircode/email/FragmentAbout.java

@@ -23,6 +23,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
+import android.preference.PreferenceManager;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -248,6 +249,10 @@ public class FragmentAbout extends FragmentEx {
             }
         });
 
+        boolean debug = PreferenceManager.getDefaultSharedPreferences(getContext()).getBoolean("debug", false);
+        btnLog.setVisibility(debug ? View.VISIBLE : View.GONE);
+        btnDebugInfo.setVisibility(debug ? View.VISIBLE : View.GONE);
+
         return view;
     }
 }