oscola and babel

Using pdfLaTeX 3.1415926-2.5-1.40.14 (TeX Live 2013/Debian) with different versions of biblatex+biber+oscola, including the latest available, I get several errors when I include babel[italian] alongside with oscola.

Here are two mwe’s I prepared.

documentclass[a4paper,10pt]{book}
usepackage{filecontents}

begin{filecontents}{jobname.bib}
@jurisdiction{VanGendenLoos,
keywords = {eu},
title = {NV Algemene Transport- en Expeditie Onderneming van Gend & Loos contro Amministrazione olandese delle imposte},
shorttitle = {Van Gend en Loos},
number = {26/62},
indexnum = {1963},
date = {1963-02-05},
journaltitle = {Racc.},
pages = {3},
institution = {ECJ},
}
end{filecontents}

usepackage[utf8]{inputenc}
usepackage[italian]{babel}

usepackage[backend=biber,style=oscola,indexing=cite,ibidstyle=uc]{biblatex}
DeclareMultiCiteCommand{footcites}[mkbibfootnote]{footcite}{multicitedelim}
addbibresource{jobname.bib}
usepackage[style=british]{csquotes}

usepackage{imakeidx}
makeindex[name=cases, title={Indice della giurisprudenza}, intoc]
makeindex[name=legislation, title={Indice della legislazione}, intoc]
DeclareIndexAssociation{eucasesnum}{cases}
DeclareIndexAssociation{eutreaty}{legislation}
DeclareIndexAssociation{euregs}{legislation}
DeclareIndexAssociation{eudirs}{legislation}
DeclareIndexAssociation{eudecs}{legislation}

listfiles

begin{document}
chapter{Caso}
casofootcite[punto 3]{VanGendenLoos}.

backmatter
printindex[legislation]
printindex[cases]
nocite{*}
printbibliography[nottype=commentary,
          nottype=jurisdiction,
          nottype=legislation,
          nottype=legal,
          heading=bibintoc]
end{document}

When I include babel, I get Bibliography string ‘eucase’ undefined(biblatex) at entry ‘VanGendenLoos’ on input line 39. In the output, in the footnote, the first word Case becomes eucase.

Here I tried to use the bibliography file oscola-examples.bib provided with the package.

documentclass[a4paper,10pt]{book}

usepackage[utf8]{inputenc}
usepackage[italian]{babel}

usepackage[backend=biber,style=oscola,indexing=cite,ibidstyle=uc]{biblatex}
DeclareMultiCiteCommand{footcites}[mkbibfootnote]{footcite}{multicitedelim}
addbibresource{oscola-examples.bib}
usepackage[style=british]{csquotes}

usepackage{imakeidx}
makeindex[name=cases, title={Indice della giurisprudenza}, intoc]
makeindex[name=legislation, title={Indice della legislazione}, intoc]
DeclareIndexAssociation{eucasesnum}{cases}
DeclareIndexAssociation{eutreaty}{legislation}
DeclareIndexAssociation{euregs}{legislation}
DeclareIndexAssociation{eudirs}{legislation}
DeclareIndexAssociation{eudecs}{legislation}

listfiles

begin{document}
chapter{Caso}
textcite{antaios85}.

backmatter
printindex[legislation]
printindex[cases]
nocite{*}
printbibliography[nottype=commentary,
          nottype=jurisdiction,
          nottype=legislation,
          nottype=legal,
          heading=bibintoc]
end{document}

I get the warnings string ‘casenote’ undefined and string ‘firstpublished’ undefined, and this reflects in casenote and firstpublished appearing in the bibliography.

Thank you for your help!