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.
Virus scan finished so I'll be pulling shortly.  Can take care of it in the merge.