Update Planning_Your_Project.md

OpenType tip via Andrew Cunningham
fontforge · Feb 1, 2016 · 3f20b46 · 3f20b46
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diff --git a/en-US/Planning_Your_Project.md b/en-US/Planning_Your_Project.md
@@ -116,6 +116,8 @@ Common features include
 * `liga` Ligatures
 * `onum`, `lnum` Numerals
 
+For some languages `locl` works but for others it doesn't, so it is best to expose language specific forms via both `locl` and `ssNN` or `cvNN`.
+
 The OpenType specification allows for some kinds of features which are not recommend:
 
 * `hist` feature. Read more in this [discussion on TypeDrawers](http://typedrawers.com/discussion/1358/what-are-the-best-practices-for-the-hist-feature-long-s).