Fix for PLFM-1396
Fix for PLFM-1396

All header elements will now break on overly-long words.
Added the word-wrap:break-word property to h1-h6.

jay-hodgson/SynapseWebClient,jay-hodgson/SynapseWebClient,Sage-Bionetworks/SynapseWebClient,Sage-Bionetworks/SynapseWebClient,Sage-Bionetworks/SynapseWebClient,jay-hodgson/SynapseWebClient,Sage-Bionetworks/SynapseWebClient,jay-hodgson/SynapseWebClient