[evolution] Clashing string in translatable text

[Milan Crha <mcrha redhat com>]

        Hello,
I've been warned about a string clash for word "Flags" in Evolution by
one of the translators. It happened when I copied gtk+' Emoji chooser
widget into Evolution sources (because gtk+ (3.x) doesn't provide it in
public API). The string is already used in Evolution in a meaning
"bit-or flags", while in the Emoji it's used like a "country flags".

I need to make a change, but I'm not sure whether I can do it without
an approval, as the code is under the string freeze.

I can think of two approaches to fix this. The first is to just mark
the clashing strings with context, but I'd say it's suboptiomal.

The second approach is to use the translation from the gtk+ package,
which is better, from my point of view (also because it keeps the Emoji
chooser texts consistent). It will also avoid unnecessary translation
strings for Evolution translators.

I've prepared a very simple patch for the second approach, I only would
like to know whether I can commit it, to not make life worse to
anybody.
        Thanks and bye,
        Milan