Add basic general log file

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

src/config/Lang.zig

@@ -20,6 +20,7 @@ err_empty_password: []const u8 = "empty password not allowed",
 err_envlist: []const u8 = "failed to get envlist",
 err_hostname: []const u8 = "failed to get hostname",
 err_lock_state: []const u8 = "failed to get lock state",
+err_log: []const u8 = "failed to open log file",
 err_mlock: []const u8 = "failed to lock password memory",
 err_null: []const u8 = "null pointer",
 err_numlock: []const u8 = "failed to set numlock",