Make password and user name requirements configurable

Summary

Fix caosdb/customers/leibniz-zmt/management#95 Implement caosdb/customers/leibniz-zmt/management#94

See also: #121 (closed)

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Test Environment

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conf/core/server.conf

@@ -209,7 +209,7 @@ USER_NAME_VALID_REGEX=^[\\w\\.][\\w\\.-]*{1,32}$
 USER_NAME_INVALID_MESSAGE=User names must have a length from 1 to 32 characters. They must contain only latin letters a-z (upper case or lower case), number 0-9, dots (.), underscores (_), or hyphens (-). They must no start with a hyphen.
 
 PASSWORD_VALID_REGEX=^((?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[\\p{Punct}]).{8,128})$
-PASSWORD_INVALID_MESSAGE=blablabla
+PASSWORD_INVALID_MESSAGE=Passwords must have a length from 8 to 128 characters. THe must contain at least one [A-Z], one [a-z], one [0-9] and a special character e.g. [!§$%&/()=?.;,:#+*+~].
 
 # --------------------------------------------------
 # Extensions