I18n: Merge similar string between editor and widgets by unescaping a character

[jorgefilipecosta]

In the calendar block in the editor, we use the string 'A calendar of your site’s posts.' in the calendar widget in PHP we use the following string 'A calendar of your site’s Posts.'. These strings should be merged.
A PR was proposed in the Gutenberg repository to change the editor string ​https://github.com/WordPress/gutenberg/pull/14975/. To follow that path we would need to add some unescape function to the editor the problem is that unescaping the string has security implications.
So here we try the opposite direction, change the core string to match the editor, locally this works well, but I am not sure if there is a reason to escape characters in core and would love some feedback or thoughts on how we can merge this strings between Gutenberg and core.
Props to @ramiy for starting this discussion in the Gutenberg repository.

[SergeyBiryukov]

In 45492:

I18N: Merge duplicate "A calendar of your site’s posts" strings used in the Calendar widget and the Calendar block in the editor.

Props jorgefilipecosta, ramiy.
Fixes #47485.

[SergeyBiryukov]

In 45493:

I18N: Correct encoding for wp-includes/widgets/class-wp-widget-calendar.php, accidentally saved in ANSI instead of UTF-8.

See #47485.