Add title to webpage when editing texture

[NateWr]

When the texture editor loads, there's no title for the webpage so the browser just shows the URL in the tab. Can we add a title here:

https://github.com/pkp/texture/blob/master/templates/editor.tpl#L13

I think it could be just the article title or "Texture | {articletitle}".

[withanage]

@NateWr Hi Nate, the above PR should add the title for the Texture editor.