i18n: Catch string concats

[akirk]

Something like this shouldn't be possible: <Gridicon icon="create" /><span>{ translate( 'Post about ' ) + title } </span>.

I am not sure if and how we could catch it. This is probably just one of many ways that concat can happen.

[aduth]

Can the concatenation ever be valid? Thinking something like { '(' + translate( 'Edited' ) + ')' } to avoid creating a separate translation entry for (Edited). Correct me if that would be desirable though.

Given how many variations there are to this, it'd be hard to catch them all. Off the top of my head, here are a few variants:

<span>{ translate( 'Post about ' ) + title }</span>
<span>{ translate( 'Post about ' ) }{ title }</span>
<span>{ [ translate( 'Post about ' ), title ].join( '' ) }</span>