Add spell check dictionary in SharePoint 2010, SharePoint 2013, and Office 365

I was looking for how to add custom spell check dictionary in SharePoint 2013 and I found this blog that describes it, http://softlanding.ca/blog/adding-words-to-the-sharepoint-spell-checker-dictionary-(sharepoint-2013-2010).

Here is the summary steps in case the above link doesn't work any more.

1. At the root level of your site create a document library called "Spelling" (make sure to name the document library exactly as listed here)
2. On your desktop create a new text file called "Custom Dictionary", so that the file name looks like "Custom Dictionary.txt" (make sure to spell the file name exactly as listed here)
3. Open the "Custom Dictionary" text file and in this file type in the words you would like NOT to be considered misspelled words (please note that the words are case sensitive so I would have a separate entry for Softlanding and softlanding, and also please make sure each word is listed on a new line)
4. Upload the "Custom Dictionary.txt" file to the "Spelling" document library (make sure the document is checked in and published
5. And now, when authoring content, the words specified in the "Custom Dictionary" file will not be considered as spelling errors. You can continue to add words to the "Custom Dictionary" file to continuously address words or acronyms that are not recognized by SharePoint.