Hi Jan-Bart,
I would like to bring the following proposals to the attention of the Board, about which we (LangCom) recommend to accept the proposals and close the wikis.
As usual, we will proceed in one week, if we don't hear anything to the contrary from the Board.

https://meta.wikimedia.org/wiki/Proposals_for_closing_projects/Closure_of_Old_English_Wikibooks_2

Rationale:
Wikibooks is for textbooks and manuals, but nobody is writing them in this extinct language nor is there much reason why someone would want to /read/ them.
Wikisource is the appropriate project for texts in this language. In fact, some pages on the wiki do belong to Wikisource, and should be moved there. This is also consistent with Langcom's previous decisions that ancient languages should above all have Wikisource, but the other projects are not all suitable for them. English Wikisource also hosts Old English texts, so there is not even a need for a separate ang-wikisource.
Content should be moved to Incubator, or, where appropriate, to Wikisoure.

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https://meta.wikimedia.org/wiki/Proposals_for_closing_projects/Closure_of_Interlingue_Wikibooks

The wiki is a case of "absence of content since its creation" (per the Closure policy). Of the few page, some should even be moved to Wiktionary (as some people noted in the discussion).
Content should be moved content Incubator, or, where appropriate, to Wiktionary.

Best regards,
MF-Warburg