uniform descriptions of recover_xy

All the arrows/spears should now have more informative descriptions regarding the chance that the'll break when firing them. Before, some of the descriptions were seriously misleading.

I also removed the recovery-chance from the plastic arrow shafts, as those are not really supposed to be fired anyway.

recover_5, 10, 15, 20, 25, are now "represented" by "bad", "below average", "good", "very good" and "excellent" chances of remaining intact, respectively.

I chose the same wording for every arrow on purpose, so people can compare their arrows and see the difference in robustness, or the lack thereof.