Updating translations

[Olly Betts]

I've been going through the code and making more strings translatable -
there are now ~50-60 strings in need of translation for most of the
languages we already have translations for.

If you use Survex in a language other than English, it would be great
if you could help get these messages translated.

There are a few sites which allow translations to be worked on online
now, and I've been trying a couple.  You need to a login in each case:

https://www.transifex.net/projects/p/survex/resource/survexpot/

https://translations.launchpad.net/survex/trunk/+pots/survex

Those links can also be found on the front page of the wiki.

Ideally we should standardise on just a single site to avoid duplicated
effort - feedback on which people prefer is welcome (so far there seem
to be things each does better than the other).  For now, I suggest
mentioning on the list if you're doing some translating work, and I'll
try to get any changes synced promptly.

Similarly, if you're using Survex and see a poorly translated message,
please go ahead and propose an improved version.

Cheers,
    Olly