.vale/styles: Removing Foreign Language references from English contents

e.g/eg or ie/i.e actually hails from Latin root and do not have any
specific general acceptance in any English standards or at least should
not be written in technical documentation. But we have a lot of these in
our documentation. Throw errors for such occurrences and replace those
with for example or that is.

Approved by:	carlavilla

.vale.ini

@@ -18,6 +18,7 @@ BasedOnStyles = FreeBSD, Vale
 FreeBSD.BrandTerms = NO
 FreeBSD.ConsciousLanguage = NO
 FreeBSD.Contractions = NO
+FreeBSD.ForeignLanguage= NO
 FreeBSD.Hang = NO
 FreeBSD.Hyphens = NO
 FreeBSD.Pronouns = NO

.vale/styles/FreeBSD/ForeignLanguage.yml

@@ -0,0 +1,11 @@
+---
+extends: substitution
+message: "Use '%s' instead of '%s'."
+ignorecase: true
+level: error
+nonword: true
+action:
+  name: replace
+  swap:
+    '\b(?:eg|e g|e\.g\.|e\. g\.)[\s,]': for example
+    '\b(?:ie|i e|i\.e\.|i\. e\.)[\s,]': that is