I know that PO / MO files are meant to be used for small strings like button names, labels, etc. Not long text like an About page, etc.
But lately I am encountering a lot of situations that are in the middle. For example, a two sentence call to action. Or a short paragraph.
Is there best practice or "rule of thumb" for when a string is too long to put in a PO file?
update
For "long" text I use partials and include the correct language version. My question is WHEN is it optimal to use one vs the other. I've heard that PO files are "inefficient" for "long" pieces of text. But what does that mean and when is it too "long"? Or is this not a concern?