Enable Spell Check in TeXlipse

• Find the dictionary for the language of your choice. You can use Aspell to create the dictionary:

  aspell --encoding=UTF-8 --lang=<lang> dump master > <lang>.dict
  

  where lang is the language code. Some common language codes are:
• English: en
• German: de
• French: fr
• Spanish: es
• Finnish: fi
• Set the Latex Project Properties under project properties
• Set the two-letter language code

Sources:

http://texlipse.sourceforge.net/manual/spelling.html

http://texlipse.sourceforge.net/faq.php