Bad strings hardcoded concatenation.

[Pedro Mendonça]

Currently there are a few new strings that concatenate like below:

• Currently your site is set to update to version X.x.x.
• Currently your site is set to update to version next development version. <-- issue
• Currently your site is set to update to version X.x.x or X.x.x or X.x.x, whichever is released first. <-- ' or ' missing gettext

Consider change to:

• Currently your site is set to update to version X.x.x.
• Currently your site is set to update to next development version.
• Currently your site is set to update to version X.x.x, X.x.x and X.x.x, whichever is released first. <-- using wp_sprintf

[Andy Fragen]

Thanks @pedro-mendonca. I'll take a look at this.