Update content
1.English translation update, more in line with reading habits

Function update
1. Cancelled the primary and secondary weapon setting, and changed to upgrade the primary weapon through monster drops. Currently you can upgrade 2 times. The upgrade effect of each main weapon is different.
1.1 Sten upgrade effect: single shot becomes sparse three shots, single shot becomes dense three shots
1.2 1931 machine gun: When changing ammunition, it can trigger Faraday shield ball
1.3 M1911: Kill 15 enemies, you can summon a floating turret, the maximum simultaneous existence of three floating turrets
1.4 Winchester Shotgun: Every time a certain number of triggers are pulled, a "bat glide round" will be released
1.5 Lee Enfield: After upgrade, the bullet has a prismatic effect and will be refracted.
1.6 2" Grenade Launcher: For every 15 rounds of grenades fired, a "Vortex Fish" is summoned.
1.7 Bren Light Machine Gun: Hedgehog rocket, fires several rockets when changing magazines.
1.8 Bazooka: For every 10 rounds fired, a marker will be placed on the ground to guide the air force to bombing.
2. Fixed some other problems