"loading" in the context of it is currently loading is indeed translated with "es 'wird [gerade] geladen"
but loading in the context of "this is the section about loading" would rather be translated as "das is der teil über Laden"
=> the category should rather be translated as "Laden"
https://developers.google.com/chart/interactive/docs/gallery/linechart?hl=de#loading
"loading" in the context of it is currently loading is indeed translated with "es 'wird [gerade] geladen" but loading in the context of "this is the section about loading" would rather be translated as "das is der teil über Laden" => the category should rather be translated as "Laden"