In this case, this is a logo, which is also a trademark (though, not a registered one as far as I can see).
Since the software does not require the logo to be present (or to be more specific, the software _license_ does not require this), and there are no restrictions on distribution (only modification), it seems to me that this logo presents no real risk or burden to our users or downstream. Additionally, it is noteworthy that the Fedora logos (and other FOSS logos such as the Firefox and Chromium logo) are part of Fedora with similar restrictions on modifying them. Ideally, these restrictions would be separated from the copyright licensing (as they would be more applicable as trademark use guidelines), but the intent is clear.
* Logos/trademarks are permissible, as long as all of the following conditions are met:
A. The logo/trademark files are distributed by the owner (or with the clear and explicit permission of the owner)
B. The logo/trademark files are distributable by third-parties.
C. The logo/trademark files have a direct relationship to software under an acceptable license that is present in Fedora (or about to be added at the same time)
D. Any existing trademark guidelines/restrictions/rules on the logos/trademarks do not prevent Fedora (or anyone) from fully exercising the rights given them in the licensing on the associated software.
Permission to modify is not required for logos/trademarks, but their use must NOT be contingent upon restrictions that would conflict with the license terms of the associated software. Two examples:
1. The associated software may require the removal or replacement of the logos/trademarks if the software is modified. Removing/replacing the logos does not prevent Fedora (or anyone) from fully exercising the rights given to them in the FOSS software license. In this case, the software and the logos would be permissible, but the logos may have to be removed/replaced if Fedora (or anyone downstream) makes modifications to the software. Packagers in such a situation should be especially careful.
2. The software license cannot require the logos/trademarks to be used in the software and simultaneously have trademark guidelines that only permit use on unmodified versions of the software. In this scenario, neither the logos nor the software would be permissible in Fedora.
If you're not sure if a logo/trademark is acceptable for inclusion, feel free to bring the specific situation to the attention of Fedora Legal for review.
Under these criteria, the lua logo would be acceptable (as would the existing Firefox/Chromium logos).