Problems translating some strings

[Ibai Oihanguren Sala]

Hello,

I'm part of the Basque translation group, and I have problems 
translating some strings. I hope anyone will be able to help me.

1.- I am translating transmission, and I have only one string left: 
"_Show |%&#x|27;d of:"

I have tried translating it as "_Erakutsi |%&#x|27;d hemendik:", and 
also copying the exact string, but I always get this error message:

'msgstr' is not a valid C format string, unlike 'msgid'. Reason: In the 
directive number 1, the character '&' is not a valid conversion specifier.

Here is the string: 
https://translations.launchpad.net/ubuntu/trusty/+source/transmission/+pots/transmission/eu/197/+translate


2.- This one has happened many times, but as an example: 
https://translations.launchpad.net/ubuntu/trusty/+source/transmission/+pots/transmission/eu/279/+translate

As the info text says, %3$s%% is a percentage.
In Basque, percentages are written this way: %25 (unlike English, or 
other languages, 25%), so, the correct translation of the string should be:

"%1$s %2$setik (%%3$s%)"

But I get this error:

"'msgstr' is not a valid C format string, unlike 'msgid'. Reason: In the 
directive number 4, the character ')' is not a valid conversion specifier."


What can I do?


Thank you very much in advance,

Ibai.
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