Replaces the text 'migrant' with 'desperate and terrified person'.Inspired by this article: https://www.opendemocracy.net/ourkingdom/shinealight/lucy-kralj/when-did-inconvenience-kill-compassion-thoughts-on-calais#.VdRCxw8dWOZ.twitter
Code based on the Cloud-to-Butt plugin: https://github.com/panicsteve/cloud-to-butt