Ensure all murano projects are ready for i18n and l10n

Currently not all user-facing strings in murano are marked for translation. Moreover even if the strings are marked for translation — the tools to perform the translation are not always there.

We should ensure, that we use oslo_i18n to mark all user-facing strings for translation
We should ensure, that we use correct tools (for example horizon switched from makemessages to babel and django-babel, to facilitate js translation)
We should ensure, that every murano-project is ready to be translated
We should integrate murano translation efforts with zanata https://translate.openstack.org and allow easy and automatic translation imports.

We should allow convenient and easy extraction and translation of MuranoPL strings. Users locale should be captured at deploy time and messages should be translated accordingly. .mo or similar files should be supplied with the apps themselves.