HTML Indexer is just this, an automated multi-language html index file generator. It can also be used as a batch image resize tool. Finally, it can also generate a thumbnail index on a paper size of your choice.
Both the html indexes and galleries as well as the "contact-sheets" are based on a list of input files. It can also be used simply as a batch image scaler cum jpg-converter, and might be extended to do other repetitive operations on the given images as well (colour balancing, etc.).
The file-list and all the preferences (html colours, fonts, etc.) can be saved in project files for multi-session work. Batch doesn't mean "unfriendly" so there is also a graphical interface.
If you find yourself often building a lot of multilingual html galleries or if you are a photographer with loads of images to index-print or if you simply find yourself changing by hand image resolutions and compression quality then this tool might make your life a lot easier.