Adding formatted = "false" helped me. it
<string name="parser_error_convert" formatted="false">Parser error, line %d, \'%s\', cannot convert \'%s\'</string>
works with my lines, and I expect this to help with your lines as well. Double %% does not help, because as a result you get %% (not%).
This problem depends on the plugin version, I am using Android Developer Studio 23.0.2.
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