Fix artifactName of build

build.gradle

@@ -38,10 +38,11 @@ group 'steamwar'
 version ''
 
 ext {
-    artifact = 'bausystem'
+    buildName = 'BauSystem'
+    artifactName = 'bausystem'
 
-    uberJarName = "${artifact}-all.jar"
+    uberJarName = "${buildName}-all.jar"
-    jarName = "${artifact}.jar"
+    jarName = "${artifactName}.jar"
     libs = "${buildDir}/libs"
 
     if (Os.isFamily(Os.FAMILY_WINDOWS)) {