The german standard infantry would be called "Infanterie". "Landser" is soldier slang and in WW1 not common, it's best known and common later in WW2 (see
Landser / german Wikipedia).
But there was no "common" infantry, all infantry regiments were dedicated to a german state, so the standard infantry would be for example a "Preußische Infanterie". And all other additional infantry should be dedicated to the next biggest and important states (behind Prussia) in the German Empire: 1. Bavaria, 2. Saxony, 3. Württemberg, 4. Baden, 5. Hessen etc (according to inhabitants in 1914). Of course it would make sense when the "Scharfschützen" would be a Bavarian unit and not some Prussians (see:
Alpenkorps / english Wikipedia).
It looks cool to have more than one standard Infantry, but according to gamplay it would make for Germany no really sense, because in 1916 all common german infantry had the same uniform colored in "Feldgrau" (field grey / see
this bavarian infantry soldier on the right and
these prussian infantry guys) and the "Stahlhelm" (see
Stahlhelm / english Wikipedia) as equipment, there would be no visual difference between them. Maybe there could be still one infantry unit with a "Pickelhaube" (see
Pickelhaube / english Wikipedia). Just to represent this nice piece of equipment what was still in use until 1916. And / or with the german field cap "Krätzchen" (see
Krätzchen / german Wikipedia). Maybe as equipment of the smaller (and less wealthy) states in the German Empire, like Saxony or Baden (sorry to those german people, don't want to insult you
). This would make sense to distinguish regiments better in any event. Here this would make sense!
But "Alpenjäger" is just the designation for a division, not for a single unit. This would be simply called "Jäger", not with any special regional addition.
Just some examples HOW it could be (designated better):Preußische Infanterie (Prussian Infantry)
(with Stahlhelm)Sächsische Infanterie (Saxon Infantry)
(with Pickelhaube / just to show the field coating, but later ones had no big red regiment numbers on it any more )
Württembergische Reserve-Infanterie (Wurttembergian reserve Infantry)
(with Krätzchen / ugh, long name, lol. just as example)Bayrische Jäger (Snipers)
Sturmtruppen (Assault Infantry)
Marine-Infanterie (Naval Infantry)
e.t.c