Merge help text for widgets

[pavelevap]

We can save translators some work when combining one string (very similar help text) for widgets and widget panel in Customizer. See attached patch.

[SergeyBiryukov]

We would still have three different strings, even four if one of the merged strings changes in the future, but not the other.

[pavelevap]

Yes, main purpose was not to translate same sentence twice. Now we have:

Widgets are independent sections of content that can be placed into widgetized areas provided by your theme (commonly called sidebars).

and

Widgets are independent sections of content that can be placed into any widgetized area provided by your theme (commonly called sidebars). To populate your sidebars/widget areas with individual widgets, drag and drop the title bars into the desired area. By default, only the first widget area is expanded. To populate additional widget areas, click on their title bars to expand them.

I thought that we can split long string, so it can be translated only once and used for both places. It would make sense, because first sentence in help tab is very common and can be used as separate paragraph (as in Customizer).

[afercia]

Patch still applies and makes sense to me. Would defer to @SergeyBiryukov ​judgment :)

[ocean90]

I agree with comment:2 and going with a wontfix here.