It happens with Spanish translations too. After upgrading to precise Kaffeine is in English and doesn't let change the language to Spanish.
As a workaround, I have downloaded the package language-pack-kde-es-base from oneiric repository and unzipped it with Ark (also unzipped data.tar.gz, which is inside the deb package) and moved the file kaffeine.mo to /usr/share/locale-langpack/es/LC_MESSAGES. After that, Kaffeine is in Spanish as it was in oneiric.
Perhaps this workaround can be applied to other languages.
It happens with Spanish translations too. After upgrading to precise Kaffeine is in English and doesn't let change the language to Spanish.
As a workaround, I have downloaded the package language- pack-kde- es-base from oneiric repository and unzipped it with Ark (also unzipped data.tar.gz, which is inside the deb package) and moved the file kaffeine.mo to /usr/share/ locale- langpack/ es/LC_MESSAGES. After that, Kaffeine is in Spanish as it was in oneiric.
Perhaps this workaround can be applied to other languages.