Add language and data format enumerations

superfaktura/enumerations/data_format.py

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+import enum
+
+
+class DataFormat(enum.Enum):
+    JSON = enum.auto()
+    PDF = enum.auto()

superfaktura/enumerations/language.py

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+class Language:
+    Czech = "cze"
+    German = "deu"
+    English = "eng"
+    Croatian = "hrv"
+    Hungarian = "hun"
+    Italian = "ita"
+    Dutch = "nld"
+    Polish = "pol"
+    Romanian = "rom"
+    Russian = "rus"
+    Slovak = "slo"
+    Slovene = "slv"
+    Spanish = "spa"
+    Ukrainian = "ukr"