Hi. I’ve suggested specific documentation improvements directly to PKP (here and here).
I just wanted to share a caveat for fellow editors working with multilingual metadata in OJS.
Currently that’s only for human interaction, as it’s not supported by CrossRef nor Google Scholar; plus, it’s not normally exposed by OJS, so it’s also not indexed in regular Google Search either. I only stress this point because it took me several years to realize multilingual metadata does not necessarily improve discoverability, unless you design a custom theme to display both languages simultaneously (see here). Fellow editors should consider if the additional effort is worth it.
The above applies to multilingual metadata of full-text content published in a single language. In case the full text is also multilingual, then publishing independent articles seem to be the closest way currently available to implement CrossRef’s recommendation for depositing multiple DOIs, one for each language. The solution is not ideal, though, because the hasTranslation and isTranslationOf relation is not yet supported in OJS. But at least the secondary language content won’t be hidden from the bots/crawlers.