SPARK-2406: Spellchecker: update dictionaries

plugins/spelling/README.md

@@ -0,0 +1,11 @@
+# Spellchecker plugin
+
+All the dictionaries were taken from the [LibreOffice](https://github.com/LibreOffice/dictionaries).
+The ru dict was taken from https://github.com/Goudron/ru-spelling-dictionary
+See the corresponding copyright and history there.
+
+On Linux you can search for dictionaries in:
+1. /usr/share/hunspell/
+2. LibreOffice: Your Personal Dictionary (Custom Added Words) : ~/.config/libreoffice/4/user/wordbook/standard.dic
+3. /usr/share/libreoffice/share/wordbook
+4. /usr/lib/libreoffice/share/wordbook/

plugins/spelling/pom.xml

@@ -13,7 +13,7 @@
     <version>0.9</version>
 
     <name>Spellchecker Plugin</name>
-    <description>Provides spellchecker functionality.</description>
+    <description>Orthography Spellchecker with Hunspell dictionaries.</description>
 
     <contributors>
         <contributor>