html-filters: fix base64 filter bytes/str operation mode

rhodecode/lib/html_filters.py

@@ -18,8 +18,8 b''
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
-## base64 filter e.g ${ example | base64,n }
+# base64 filter e.g ${ example | base64,n }
 def base64(text):
     import base64
-    from rhodecode.lib.helpers import safe_str
-    return base64.encodestring(safe_str(text))
+    from rhodecode.lib.helpers import safe_str, safe_bytes
+    return safe_str(base64.encodebytes(safe_bytes(text)))