Thumbnail
Transliteration is hard.
From
English (United States)
English (United States)
To
Japanese
日本語
サムネイルサイズ
サムネールの内容
Both サムネイル and サムネール are valid transliteration of the word thumbnail. See Variation in notations (Japanese Wikipedia).
The inconsistency has since been fixed followed up by an Adobe Community Manager.