Text editor: Always use UTF-8 to keep Ace happy.

apps/files_texteditor/ajax/loadfile.php

@@ -43,6 +43,7 @@ if(!empty($filename))
 	{
 		$mtime = OC_Filesystem::filemtime($path);
 		$filecontents = OC_Filesystem::file_get_contents($path);
+		$filecontents = iconv(mb_detect_encoding($filecontents), "UTF-8", $filecontents);
 		OCP\JSON::success(array('data' => array('filecontents' => $filecontents, 'write' => 'false', 'mtime' => $mtime)));	
 	}	
 } else {

apps/files_texteditor/ajax/savefile.php

@@ -48,6 +48,7 @@ if($path != '' && $mtime != '' && $filecontents)
 		// Save file
 		if(OC_Filesystem::is_writable($path))
 		{
+			$filecontents = iconv(mb_detect_encoding($filecontents), "UTF-8", $filecontents);
 			OC_Filesystem::file_put_contents($path, $filecontents);
 			// Clear statcache
 			clearstatcache();