Use a multibinding with the StringFormatConverter. The first parameter is the StringFormat All others are parameter.
<element.Text>
<MultiBinding Converter={lex:StringFormatConverter}>
<lex:BLoc Path="assembly:resource:key" />
<Binding Foo />
<Binding Bar />
<Binding ... />
</MultiBinding>
</element.Text>
integrate SmartFormat so that we have even a possibility to have real i18n with pluralization,...