Template:Lang is used as an optional word break. This makes it like an invisible space.
It is useful for use in column headers where long words may be used that stretch the column on smaller resolutions. Instead of a
<br> that will split the word even on browsers where the text is not too wide for the column, this can be used.
The content of this template is the HTML numeric reference
The template is named after the HTML
<wbr> tag that performs a similar function.