Fix tablesorter position

[Otshelnik-Fm]

The sorting icon is very close in the table: ​http://joxi.ru/xAelOzvHb9Qa72

Example: ​https://translate.wordpress.org/projects/wp-plugins/wp-recall/

Add this:

.tablesorter-wporg-translate .tablesorter-header {
	background-position-x: calc(100% - 10px);
}
.tablesorter-header-inner {
	margin: 0 15px;
}

Result: ​http://joxi.ru/1A5eaNXizVeWWA

And the title will not run over the icon - because we have set a margin for it:
​http://joxi.ru/l2Z8QalHRg93Xr

Now the table header is overlapped by the icon:
​http://joxi.ru/a2XyGdKSlqXdBA

[SergeyBiryukov]

Thanks for the ticket!

Just noting that this should also be tested on the ​Translation status overview page, which has narrower columns and does not look great with the currently proposed changes: 6082.status-overview.png​.

[SergeyBiryukov]

I think 6082.diff​ might improve things a bit, it aims to prevent overlapping while still having enough breathing room. See 6082.status-overview.current.png​ vs. 6082.status-overview.after.png​.

[SergeyBiryukov]

In 11531:

Translate: Improve positioning of the column sorting icon.

This aims to avoid overlapping with column headers while adding some space for the icon.

Props Otshelnik-Fm.
Fixes #6082.