Provide an alternative (text) for the abbreviation "Gl."

[mfranzke]

Currently "track" (German: "Gleis") is only written as "Gl.". We should provide an alternative text to the tag element that contains this track number, e.g. by a title-attribute like e.g. "Gleis 10" in combination with even also providing this alternative text within the aria-label-attribute.

https://db-ui.github.io/core/patterns/elements-tags/index.html