Hi Alexander,
Yes, it would be beneficial to have those keys translated. The ..TableSummary ones would be read out loud by a screen reader. Also when it reads the rows of the table, it will say the heading name before reading the value of each cell because the td has headers=(id of th)
Of course the effort to translate these keys will only benefit a very small percent of users but it may also help search indexes to relate the headers with the content.
Thanks,
Joe