I'm assuming your attribute levels (other than price and the translation into languages) is the same for all countries. Prices differ across countries.
Here's a procedure that can work:
1. Each country gets its own ACBC exercise, translated into its own language and using the currency and prices that are realistic to each country.
2. Choose the reference currency (say Euros) that will be used to unify the market simulator onto the same price scale during the final analysis. This is the currency that will be used in the market simulator, which all other currencies used will be converted to during analysis.
3. Next, create a common currency mapping to specific price amounts. This must cover the entire range of prices (in real terms) shown across all countries.
For example, let's imagine that the "common currency map" (in Euros) for constructing the final market simulator will have the following prices:
100, 110, 120, 130, 140, 150, 160, 170, 180
...for the 9 price levels on the map (which cover the full price, expressed in Euros, ever shown across all countries).
After collecting the data for each country separately (where different countries used different currencies and may have gotten very different absolute price ranges shown), for each country separately estimate HB utilities using the piecewise summed price function with the 9 "common currency map" cutpoints and endpoints that convert to the common Euro price points.
Imagine that we are estimating HB utilities for USA respondents who saw prices in US dollars (1.2 dollars to the Euro). In the HB estimation dialog for USA respondents, we select piecewise coding for the summed price variable, and we type the following prices in the resulting dialog:
120, 132, 144, 156, 168, 180, 192, 204, 216
...and the utility estimation for the USA respondents will compute the discrete utility associated with each of those dollar prices, which map back to the common currency map in Euros.
4. To bring all the utilities from the different countries into a common Sawtooth Software simulator, from the Analysis manager within each country's ACBC project you will Export the utilities (select raw utilities!) to a .HBU file (Save as type "Legacy conjoint file (*.hbu)").
You will now have a separate .hbu file (a text file that you can open with Notepad or Wordpad) for each country. Each .HBU file has a set of global header rows which give labels and utility layout for the file. Then, below the header you'll see the respondent records (one row per respondent) with utility values.
Using a text editor, stack all the respondent data from the different countries (if the respondent numbers aren't already unique across countries, you'll want to modify them so they are unique). Select the header that is the language you want in the simulator to be the global header for your stacked .HBU file. Save the new .HBU file that has the (one, single) global header (block of header rows) followed by all respondent data.
5. Using Sawtooth Software's standalone choice simulator (looks and acts essentially the same as the simulator included within Lighthouse Studio), create a new simulator project by importing the .HBU file (that contains the global block of header rows followed by all respondent utility data, where the respondents have unique ID numbers). Using the market simulator interface, click that the Price attribute is "continuous" as "is price" and edit the Values associated with the 9 levels of price to be the common Euro mapping of the prices. Merge a new demographic variable (country) into the simulator project that assigns each respondent to his/her country.
6. To create a unified market simulator that simulates for all respondents simultaneously and allows you to specify different prices (in terms of the Euro scale) for different countries, use (on the My Scenario Settings tab) the "Apply Product Availability (Multi-Store)" option. Each country becomes its own "store/region" where you can assign respondents to visit only their own "store". You can thus specify the same product multiple times with different prices, where each product is the product applying to each different country market. Only the respondents belonging to the country are allowed to "shop" in that country's "store." You can use the "Netted Shares" option in the simulator to sum and report as a net the shares of preference for each product across the different countries.