Fix "mvn test" on Windows

[ttntrifork]

Make mvn test able to run on Windows OS and with a locale that uses , as decimal separator

[codecov]

Codecov Report

Base: 81.86% // Head: 81.02% // Decreases project coverage by -0.83% ⚠️

Coverage data is based on head (d2cd75e) compared to base (e7a4c49).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4178      +/-   ##
============================================
- Coverage     81.86%   81.02%   -0.84%     
- Complexity    20838    23438    +2600     
============================================
  Files          1421     1444      +23     
  Lines         77246    86079    +8833     
  Branches      11078    11780     +702     
============================================
+ Hits          63236    69744    +6508     
- Misses         9866    11070    +1204     
- Partials       4144     5265    +1121     

Impacted Files	Coverage Δ
...a/uhn/fhir/context/BaseRuntimeChildDefinition.java
...ir/context/BaseRuntimeDeclaredChildDefinition.java
...n/java/ca/uhn/fhir/context/RuntimeSearchParam.java
...-fhir-base/src/main/java/ca/uhn/fhir/i18n/Msg.java
...ain/java/ca/uhn/fhir/interceptor/api/Pointcut.java
...r/interceptor/executor/BaseInterceptorService.java
...n/java/ca/uhn/fhir/parser/ErrorHandlerAdapter.java
...e/src/main/java/ca/uhn/fhir/parser/JsonParser.java
...n/java/ca/uhn/fhir/parser/LenientErrorHandler.java
...ain/java/ca/uhn/fhir/parser/ParseErrorHandler.java
... and 2844 more

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