Answer:
My first half means container. Not a lot of people understand my language.
My first is second in line; I send shivers up your spine; not quite shining bright I glitter in the light.
I tremble at each breath of air and yet can heaviest burdens bear.
I travel in a gaggle.
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
What language does a billboard speak?