Small widget strings optimization

[pavelevap]

See attached patch for details.

• "Search" string for default widget needs a context (noun), in other places it is verb.

• Missing point in 2014, all widgets have points in the end.

• One not needed comma.

Not in patch: Tag cloud should be Taxonomy cloud now?

[SergeyBiryukov]

One not needed comma.

I think that's an ​Oxford comma.

[pavelevap]

Interesting, I did not know about that, it is wrong way in our language :-)

Comma can be preserved, but I would change ampersand entity to "and" in this case.

[Hanni]

Patch to maintain pavelevap's changes but restore oxford comma.

[Hanni]

Opinion is divided on the use of Oxford (or serial) commas and ampersands, but, for the sake of both consistency and the timing in the release cycle here is the "fix" suggested by @SergeyBiryukov for @pavelevap's original patch.

[kpdesign]

+1 for 26668.1.diff​

[johnbillion]

In 27412:

Add context and a missing period to widget descriptions. Fixes #26668. Props pavelevap, Hanni