The approach could be to use a MarkupExtension that would be able to get localized strings from resource dictionaries. It will allow you to specify the source dictionary globally for a whole view, or locally for part of the UI using an inheritable attached property (and more things like fallback texts for design time), something like this:

<Grid

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:l="clr-namespace:Localization"

l:Loc.Source="Languages/lang-en.xaml">

<TextBlock Text="{l:Loc PageTitle, Id=Title}"/>

...

<StackPanel l:Loc.Source="Languages/lang-fr.xaml">

<TextBlock Text="{l:Loc Id=Name}"/>...

<TextBlock Text="{l:Loc Id=Address}"/>...

</StackPanel>

</Grid>