[0.10.9] typos "Pistol can't shoot Shotgun shellss." etc...

[pyrolytic_tungsten]

When attempting to put the pistol into an empty weapons slot with shotgun shells in the matching ammo slot it says "Pistol can't shoot Shotgun shellss." "shellss" should be "shells".

Similarly when attempting to put the combat shotgun in a weapons slot whose ammo slot contains flamethrower ammo you get "Combat shotgun can't shoot Flamethrower Ammos." The plural of ammo is ammo (since it is an uncountable noun) so "Ammos" should be "ammo".

[cube]

Thanks, fixed for 0.10.10.