Translation problem for some strings?

[Thomas De Schampheleire]

Hi Andrew, all,

I notice a problem with translation: some strings never seem to be
translated, even if the translation file contains a translation.
One example is the string 'Pull Requests' which is visible as a button
top-right when viewing a repository.

For example, both 'fr' and 'ru' contain a translation for this string,
but it does not show in the web UI.

Do you have any idea about this?
Do you see the same?

Thanks,
Thomas