Adjusting weapon descriptions

This should only be merged with https://git.empiresmod.com/empires_assets/assets_base/merge_requests/31 because of potential display issues.

Update to weapon names and descriptions. Brings them up to date, fixes spelling and punctuation errors.

Changed descriptions of:

• NF 9mm Pistol

• NF Buckshot

• NF Ranged SMG

• NF Close Quarters SMG

• NF Scoped Rifle

• NF .50 Cal Rifle

• NF Light Machine Gun

• NF RPG Launcher

• NF Explosive Grenade

• NF Smoke Grenade

• NF Sticky Bomb

• NF Sticky Stun Bomb

• BE 9mm Pistol

• BE .44 Pistol

• BE Machine Pistol

• BE Ranged SMG

• BE Close Quarters SMG

• BE Assault Rifle

• BE Light Machine Gun

• BE RPG Launcher

• BE Smoke Grenade

• BE Sticky Bomb

Changed names of:

• NF 50cal rifle -> NF .50 Cal Rifle
• NF Explosive grenade -> NF Explosive Grenade