Fix missing brightness localized strings

Signed-off-by: AnErrupTion <anerruption@disroot.org>

src/config/Lang.zig

@@ -1,4 +1,6 @@
 authenticating: []const u8 = "authenticating...",
+brightness_down: []const u8 = "decrease brightness",
+brightness_up: []const u8 = "increase brightness",
 capslock: []const u8 = "capslock",
 err_alloc: []const u8 = "failed memory allocation",
 err_bounds: []const u8 = "out-of-bounds index",
@@ -56,5 +58,3 @@ sleep: []const u8 = "sleep",
 wayland: []const u8 = "wayland",
 xinitrc: [:0]const u8 = "xinitrc",
 x11: []const u8 = "x11",
-brightness_down: []const u8 = "decrease brightness",
-brightness_up: []const u8 = "increase brightness",