The App Store Manager supports a wide range of languages.
However, different functions are available for the individual languages. the following table illustrates these:

#LanguageGoogle Play StoreApp Store ConnectMetadata transferScreenshot transferAutomatic translationAdvanced automatic translation*
1Afrikaans – afx xxx 
2Amharic – amx xxx 
3Arabic – arxxxxx 
4Armenian – hy-AMx xxx 
5Azerbaijani – az-AZx xxx 
6Basque – eu-ESx xx  
7Belarusian – bex xx  
8Bengali – bn-BDx xxx 
9 Bulgarian – bgx xxxx
10Burmese – my-MMx xx  
11Catalan – caxxxxx 
12Chinese (Hong Kong) – zh-HKx xx  
13Chinese (Simplified) – zh-CNxxxxxx
14 Chinese (Traditional) – zh-TWxxxxx 
15Croatian – hrxxxxx 
16Czech – cs-CZxxxxxx
17Danish – da-DKxxxxxx
18Dutch – nl-NLxxxxxx
19English – en-AUxxxxxx
20English – en-CAxxxxxx
21English – en-INx xxxx
22English – en-SGx xxxx
23English (United Kingdom) – en-GBxxxxxx
24English (United States) – en-USxxxxxx
25Estonian – etx xxxx
26Filipino – filx xxx 
27Finnish – fi-FIxxxxxx
28French – fr-FRxxxxxx
29French (Canada) – fr-CAxxxxxx
30Galician – gl-ESx xx  
31Georgian – ka-GEx xx  
32German – de-DExxxxxx
33Greek – el-GRxxxxxx
34Hebrew – iw-ILxxxxx 
35Hindi – hi-INxxxxx 
36Hungarian – hu-HUxxxxxx
37Icelandic – is-ISx xxx 
38Indonesian – idxxxxx 
39Italian – it-ITxxxxxx
40Japanese – ja-JPxxxxxx
41Kannada – kn-INx xxx 
42Khmer – km-KHx xxx 
43Korean (South Korea) – ko-KRxxxxx 
44Kyrgyz – ky-KGx xx  
45Lao – lo-LAx xxx 
46Latvian – lvx xxxx
47Lithuanian – ltx xxxx
48Macedonian – mk-MKx xx  
49Malay – msxxxxx 
50Malayalam – ml-INx xxx 
51Marathi – mr-INx xxx 
52Mongolian – mn-MNx xx  
53Nepali – ne-NPx xxx 
54Norwegian – no-NOxxxxx 
55Persian – fax xxx 
56Polish – pl-PLxxxxxx
57Portuguese (Brazil) – pt-BRxxxxxx
58Portuguese (Portugal) – pt-PTxxxxxx
59Romanian – roxxxxxx
60Romansh – rmxxxx  
61Russian – ru-RUx xxxx
62Serbian – srx xxx 
63Sinhala – si-LKx xx  
64Slovak – skxxxxxx
65Slovenian – slx xxxx
66Spanish (Latin America) – es-419xxxxxx
67Spanish (Spain) – es-ESx xxxx
68Spanish (United States) – es-USxxxxxx
69Swahili – swx xxx 
70Swedish – sv-SExxxxxx
71Tamil – ta-INx xxx 
72Telugu – te-INx xxx 
73Thai – thxxxxx 
74Turkish – tr-TRxxxxx 
75Ukrainian – ukxxxxx 
76Vietnamese – vixxxxx 
77Zulu – zux xx  

*the advanced translation is part of the Business Plan