Tests fail on systems with non ENGLISH locale

[DarkAtra]

When running mvn clean install -Dgpg.skip=true on a system with a german locale, many tests fail with:

java.lang.NumberFormatException: For input string: "18,58"

The number in the exception messages changes randomly as it is generated by javafaker. It seems like javafaker does not respect the locale when formatting prices, see: DiUS/java-faker#433.

Possible solutions:

• update javafaker to https://github.com/datafaker-net/datafaker (which fixes the underlying issue) - note that datafaker 2.x requires at least java 17
• explicitly set the locale in code for all tests that depend on javafaker, like so: Locale.setDefault(Locale.ENGLISH);
• explicitly set the locale in surefire like so:

  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>${surefire.version}</version>
    <configuration>
        <argLine>@{argLine} -Duser.language=en -Duser.country=EN</argLine>
    </configuration>
  </plugin>