Is there any language that can be Turing-reduced to all languages?
Every Turing-decidable language is Turing-reducable to every language.
According to the definition in Wikipedia,

Given two sets $A,B \subseteq \mathbb{N}$ of natural numbers, we say $A$ is Turing reducible to $B$ and write
$$A \leq_T B$$
if there is an oracle machine that computes the characteristic function of $A$ when run with oracle $B$.

Now if $A$ is decidable, the oracle machine can decide $A$ even without the use of the oracle, so $A$ is Turing-reducible to every language.