What the peoples of Germany desire most impatiently is that talented commoners should have the same right to your esteem and to public employments as the nobles, that any trace of serfdom and of an intermediate hierarchy between the sovereign and the lowers class of people should be completely abolished. The benefits of the Napoleonic code, the publicity of judicial procedure, the creation of juries must be so many distinguishing marks of your monarchy
He is saying that the lower, working class people of Germany desire freedom to gain as much, and to have the same respect as the noble or upper class.
You would do better to ask this question on the history site, but I will address it briefly.
What you have here is some of the ideology of the French Revolution. Napoleon's campaigns in Europe were ostensibly to carry this to all peoples of Europe, most notably to the German states.
Many will argue Napoleon was simply an imperialist and scavenger. But it was the crescendo of Aux armes citoyens (take up your weapons, citizens), in the anthem La Marseillaise which accompanied the hooves of the French cavalry, at Jena, Austerlitz and elsewhere.
And he put the fear of God into the aristocracies of Europe, including in Britain.