我想他们现在已经没有这个语言障碍了吧。用英语怎么说？

i don't think they have any language barriers anymore.
语言障碍叫language barrier, 不叫obstacle,虽然它也是障碍的意思，外国人也能明白，但是language barrier是固定搭配

I guess they don't have the language obstruction now.

I think they should have no such language obstacle.

I don't think they still have that language barrier.

I guess language won't be an obstacle for them any more.
要注意英语的语言习惯。地道的表达应为“语言对他们来说不是障碍”，英美国人就是不说“谁谁谁没有障碍”。
另外，language barrier 和 language obstacle都可以。google上都有对应的词条。

I don't think they have that language barrier any longer.