When asked if we have a "standard price per page" or how much we charge for "jobs in InDesign", or how much we charge "per hour", we tend to answer the same way a used-car dealer would if asked if he has a standard price for used cars: that depends on a number of things.
In order to keep our prices competitive, we need to charge differently according to types of contents and processes. Similarly, people having very different levels of skills, charging per the hour is neither practical, nor necessarily fair. Our prices are therefore fixed by a quotation for each project.
The best way to get a precise price for a DTP localisation job is to request quotation by sending us a reference document in PDF format (either the same document in a different language, or a similar document from a previous period) and telling us briefly what is needed and any other relevant information, so we can at least give an estimate on that basis, while waiting for other artwork files, as the case may be.