add category of graded abelian groups

src/math/categories.pysty3

@@ -137,3 +137,8 @@ __HEADER__(Definitions of categories with automatic indexing)%% Wrapper commands
   [
     \translate{Sch~(Category~description)}
   ]
+\DeclareSimpleCategory
+  { GrAb }
+  [
+    \translate{GrAb~(Category~description)}
+  ]

src/utils/mathematical-categories.pydict

@@ -0,0 +1,18 @@
+key,English,German
+Index of categories,Index of categories,Kategorienverzeichnis
+Top (Category description), spaces and continuous maps, Räume und stetige Abbildungen
+Set (Category description),Sets and functions,Mengen und Funktionen
+hTop (Category description),Spaces and homotopy classes of continuous maps,Räume und Homotopieklassen von stetigen Abbildungen
+CHaus (Category description),Compact hausdorff spaces and continuous maps,Kompakte Hausdorffräume und stetige Abbildungen
+Grp (Category description),Groups and homomorphisms,Gruppen und Homomorphismen
+Ab (Category description),Abelian groups and homomorphisms,Abelsche Gruppen und Homomoorphismen
+CRing (Category description),Commutative rings and homomorphisms,Kommutative Ringe und Homomorphismen
+Ring (Category description),Rings and homomorphisms,Ringe und Homomorphismen
+Vect (Category description),$k$-vector spaces and linear maps,Vektorräume und lineare Abbildungen
+Cat (Category description),Small categories and functors,Kleine Kategorien und Funktoren
+Mod (Category description),Left $R$-modules and homomorphisms,$R$-Linksmodule und Homomorphismen
+Alg (Category description),$k$-algebras and homomorphisms,$k$-Algebren und Homomorphismen
+Field (Category description),Fields and field extensions,Körper und Körpererweiterungen
+AffVar (Category description),Affine Varieties over $k$,Affine Varietäten über $k$
+Sch (Category description),Schemes and homomorphisms,Schemata und Homomorphismen
+GrAb (Category description),Graded abelian groups and homomorphisms,Graduierte Gruppen und Homomorphismen