i18n: Add zh_CN Translation

resources/i18n/zh_CN/cosmic_comp.ftl

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+grow-window = 窗口放大
+shrink-window = 窗口缩小
+swap-windows = 改换窗口
+stack-windows = 叠放窗口
+unknown-keybinding = 未设定的键
+window-menu-minimize = 最小化
+window-menu-maximize = 最大化
+window-menu-tiled = 平铺模式
+window-menu-screenshot = 截图
+window-menu-move = 移动
+window-menu-resize = 设置窗口大小
+window-menu-move-prev-workspace = 移动到上一个工作区
+window-menu-move-next-workspace = 移动到下一个工作区
+window-menu-stack = 叠放模式
+window-menu-unstack-all = 解除所有窗口叠放
+window-menu-unstack =  解除当前窗口叠放
+window-menu-sticky = 置顶
+window-menu-close = 关闭
+window-menu-close-all = 关闭所有窗口
+window-menu-resize-edge-top = 拉伸至顶部
+window-menu-resize-edge-left = 拉伸至左边
+window-menu-resize-edge-right = 拉伸至右边
+window-menu-resize-edge-bottom = 拉伸至底部