Improve language negotiation #175

Job	Run time
GS64 v3.7.0 + Application-Configuration	37s
GS64 v3.7.0 + Application-Control	37s
GS64 v3.7.0 + Application-Info	32s
GS64 v3.7.0 + Core	31s
GS64 v3.7.1 + Application-Configuration	29s
GS64 v3.7.0 + Dependent-SUnit-Extensions	44s
GS64 v3.7.1 + Application-Control	28s
GS64 v3.7.0 + Deployment	40s
GS64 v3.7.0 + Examples	37s
GS64 v3.7.1 + Application-Info	26s
GS64 v3.7.0 + HealthCheck	34s
GS64 v3.7.1 + Core	25s
GS64 v3.7.0 + Metrics	33s
GS64 v3.7.1 + Dependent-SUnit-Extensions	40s
GS64 v3.7.0 + JSON-RPC	35s
GS64 v3.7.1 + Deployment	36s
GS64 v3.7.1 + Examples	35s
GS64 v3.7.1 + HealthCheck	30s
GS64 v3.7.1 + Metrics	41s
GS64 v3.7.1 + JSON-RPC	26s
	11m 16s

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