[entropy.qa] catch FileNotFound when calling read_elf_broken_symbols

This fixes bug #4632
[client] update translations
[Rigo] update translations
Release Entropy 275
Tagging Entropy version 275
[entropy.qa] move is_system_pkg to instance method
[entropy.qa] filter out missing sonames if they belong to system packages

When warning user for potentially broken ELF objects, it is better
to filter out sonames pointing to system packages.
[entropy.qa] do not account for broken executables if there are no missing sonames
[eit.commands.repack] do not set self._packages, adds unnecessary elaboration
[eit.commands.commit] fix "eit add foo" (when foo does not exist)
[eit.command.status] fix _calculate_local_upload_files() usage
Release Entropy 276
Tagging Entropy version 276
Merge remote-tracking branch 'upstream/master'