Documents with % and spaces version download issue.

Customer reported that documents with "%" and "spaces" in filename with versions could not download the previous version.

Steps to replicate:

1. Create a word document called "name with % in it break alfresco %.docx and upload to share.
2. Then upload a version to it of the same file and assign either minor or major version.
3. Try and download the previous version should result in a HTTP ERROR 400.

I found that the file name is not getting URL encoded properly, inspecting broken link with developers tools I see the following:

<a href="http://10.245.50.119:8080/share/proxy/alfresco/api/node/content/versionStore/version2Store/f0dd2369-307d-4194-9e39-96a7ee783e5c/name with % in it break alfresco % maybe.docx?a=true" class="download" title="Download" id="yui-gen41">&nbsp;</a>

If I take the file "name with % in it break alfresco % maybe.docx" , then URL encode it to be "name+with+%25+in+it+break+alfresco+%25+maybe.docx", paste back into developer tools replacing non-encoded file name the link worked.