In FooterRes_pt_PT.js the deselectAll entry is a JS string which contains some of Portuguese special chars, but the whole string is encoded unnecessarily as a JS Unicode string using \uXXXX notation. This is clearly suboptimal.
Same for several other files. Should be changed to ASCII, with \uXXXX only when necessary.
Separate, but related issue is that in Polish resources, there are no Polish special chars at all - they should be added in scope of this issue as well.
fix #313 suboptimal encoding of non-ASCII resources
Removed unnecessary escaping of some characters.
Added Polish special chars to Polish resources.
Pull request #317.