MDL-8090 Added new help file. Merged from stable

diff --git a/lang/en_utf8/help/langpackages.html b/lang/en_utf8/help/langpackages.html
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+<h1>Language packages</h1>
+
+<dl>
+  <dt>Master English pack</dt>
+
+  <dd>is primary source of all built-in texts in Moodle. It is distributed as a
+  part of Moodle and plugins. It consists of PHP string files and HTML help
+  files in the folder &quot;en_utf8&quot;. All add-on plugins (modules, blocks,
+  etc.) have to contain their own master English files. Master English pack
+  can't be edited via lang.php.</dd>
+
+  <dt>Master language pack</dt>
+
+  <dd>is official translation of Master English pack. Usually, it is maintained
+  by a voluntary member of the community. Master language packs for Moodle core
+  can be updated automatically from admin menu under "Languages" (you will
+  find a utility that allows you to select, download and install these language
+  packs directly from within Moodle). They can also be downloaded manually from 
+  <a href="http://download.moodle.org/lang16/" target="_blank">http://download.moodle.org</a>.
+  </dd>
+
+  <dt>Local modifications</dt>
+
+  <dd>of master language pack are stored in separate directory on your server.
+  Therefore, you can update master language pack without overwriting your on-site 
+  customization.</dd>
+
+</dl>