提交crossbows-backport翻译 (#4495)

* 提交crossbows-backport翻译

* Update zh_cn.lang

projects/1.12.2/assets/crossbows-backport/crossbows/lang/en_us.lang

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+item.crossbows.Crossbow.name=Crossbow
+item.crossbows.crossbow.projectile=Projectile:
+
+subtitles.crossbows.item.crossbow.charge=Crossbow charges up
+subtitles.crossbows.item.crossbow.load=Crossbow loads
+subtitles.crossbows.item.crossbow.shoot=Crossbow fires
+
+enchantment.crossbows.multishot=Multishot
+enchantment.crossbows.quickcharge=Quick Charge
+enchantment.crossbows.piercing=Piercing
+
+death.attack.crossbows.fireworks.player=%1$s went off with a bang whilst fighting %2$s
+
+advancements.adventure.arbalistic.title=Arbalistic
+advancements.adventure.arbalistic.description=Kill five unique mobs with one crossbow shot 
+advancements.adventure.ol_betsy.title=Ol' Betsy
+advancements.adventure.ol_betsy.description=Shoot a crossbow

projects/1.12.2/assets/crossbows-backport/crossbows/lang/zh_cn.lang

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+item.crossbows.Crossbow.name=弩
+item.crossbows.crossbow.projectile=弹射物：
+
+subtitles.crossbows.item.crossbow.charge=弩：蓄力
+subtitles.crossbows.item.crossbow.load=弩：装填
+subtitles.crossbows.item.crossbow.shoot=弩：发射
+
+enchantment.crossbows.multishot=多重射击
+enchantment.crossbows.quickcharge=快速装填
+enchantment.crossbows.piercing=穿透
+
+death.attack.crossbows.fireworks.player=%1$s 在与 %2$s 战斗时随着一声巨响消失了
+
+advancements.adventure.arbalistic.title=劲弩手
+advancements.adventure.arbalistic.description=用弩一发击杀五只不同的生物
+advancements.adventure.ol_betsy.title=扣下悬刀
+advancements.adventure.ol_betsy.description=用弩进行一次射击