Restrict replacement to the end of the string

tubesync/sync/templatetags/filters.py

@@ -10,5 +10,5 @@ def bytesformat(input):
     output = filesizeformat(input)
     if not (output and output.endswith('B')):
         return output
-    return output.replace('B', 'iB')
+    return output.replace('B', 'iB', -1)