Add Tests for parsing, international, and script help.

test/powershell/Language/Scripting/en-US/if.psd1

@@ -0,0 +1,7 @@
+if($psculture -eq 'en-US')
+{
+    ConvertFrom-StringData @'
+        string1=string1 for en-US in if
+        string2=string2 for en-US in if
+'@
+}