App G. Localization

Polish text and add new contents to "App G. Localization":

* Provide some general guidelines on how to approach localizing Alan
  to new languages.
* Explain how to exploit *noise* Player-Words and `Synonyms` in i18n
  to handle articles variations in languages with grammatical gender.
* Add "Useful Links" section at the end.
* Annotate problems and TODOs (via comments).
* Update "G.5. Word Order" (TBD): provide answers to annotated questions
  regarding the possibility of using `Syntax`es with param in first
  position. Update TBD admonition note accordingly. (See #61)
* Rebuild HTML & PDF Manual.

Change document `revremark` to "Beta7 Ed. work".

manual/manual.asciidoc

@@ -1,7 +1,7 @@
 :doctitle:  The ALAN Adventure Language Reference Manual
-:revnumber: 0.1.98-PreReleaseBeta7
-:revdate:   September 1, 2019
-:revremark: AsciiDoc conversion work
+:revnumber: 0.1.99-PreReleaseBeta7
+:revdate:   September 11, 2019
+:revremark: Beta7 Ed. work
 :doctype: book
 :encoding: utf-8
 :lang: en