i18n(zh_TW): add Taiwanese translation

resources/i18n/zh-TW/cosmic_comp.ftl

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+grow-window = 放大窗口
+shrink-window = 縮小窗口
+swap-windows = 交換窗口
+stack-windows = 疊加窗口
+unknown-keybinding = <未設定>
+window-menu-minimize = 最小化
+window-menu-maximize = 最大化
+window-menu-tiled = 浮動窗口
+window-menu-screenshot = 擷圖
+window-menu-move = 移動
+window-menu-resize = 調整大小
+window-menu-move-prev-workspace = 移至前一工作區
+window-menu-move-next-workspace = 移至下一工作區
+window-menu-stack = 建立窗口堆疊
+window-menu-unstack-all = 解散所有窗口堆疊
+window-menu-unstack = 解散窗口堆疊
+window-menu-sticky = 窗口置頂
+window-menu-close = 關閉
+window-menu-close-all = 關閉所有窗口
+window-menu-resize-edge-top = 頂部
+window-menu-resize-edge-left = 左側
+window-menu-resize-edge-right = 右側
+window-menu-resize-edge-bottom = 底部