Rename "Rebuild Python env" button to "Build...*"

Rebuild implies to me it already exists, which it may not

Author: hinerm

src/main/java/org/scijava/plugins/scripting/python/OptionsPython.java

@@ -70,7 +70,7 @@ public class OptionsPython extends OptionsPlugin {
 	@Parameter(label = "Python environment directory", persist = false)
 	private File pythonDir;
 
-	@Parameter(label = "Rebuild Python environment", callback = "rebuildEnv")
+	@Parameter(label = "Build Python environment", callback = "rebuildEnv")
 	private Button rebuildEnvironment;
 
 	@Parameter(label = "Launch in Python mode", callback = "updatePythonConfig",