KLocale method for removing accelerator markers

[Chusslove Illich]

>> [: Chusslove Illich :]
>> At places KDE code does <some_ui_label>.remove('&')[...] this does not
>> work [...] for CJK-style markers ("&Open With..." ->
>> "アプリケーションで開く(&O)...", where complete "(&O)" should be removed as marker).
>> [...] So far we encountered several places [where this is needed]
>
> [: Allen Winter :]
> Looks good. Please commit.

I've committed it, but with something little extra.

At few of the mentioned places, it is Qt that's removing the marker; while
it of course takes escaped markers into consideration, it does not CJK
markers. This leaves a dangling "...(X)" in CJK labels. So I've added that
such "reduced" markers are removed too, but only if the label contains a CJK
character otherwise (approximated as unicode point >= 2E00).

The proper solution is probably to shift this uprated marker removal into Qt
itself at some point.

-- 
Chusslove Illich (Часлав Илић)
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