I would recommend using Python and specifically creating extensions for Inkscape. I don't think you really need 60 SVG unless you really want to because the source map will have everything you need.
What I would do is use Inkscape to rename the various regions to the same language code you will be using. For example, Cahuilla or cah is currently path13882
in your SVG file. I would rename it to cah
or Cahuilla
and repeat the process for each of the language regions. Use the Edit\XML Editor to help make sure you update all of the paths.
After you have updated the names/IDs, then you might look into SVG scripting. I would just create a javascript/ecmascript map or dictionary that has the relevant information for the language:
var langaugeMap = {};
languageMap["cah"] = { name: "Cahuilla", color: "rgb(255, 0, 0)" };
languageMap["cup"] = { name: "Cupeño", color: "rgb(255, 64, 0)" };
// and so on -- this could even be generated from a CSV file or Excel, etc.
// if the highlighted color is always the same, then you don't need it in the map
// or use style sheets for an activeshape and inactiveshape
// Put any information that is specific to a language in the map
Then you just need to add a mouseover function that would add and position the bounding box and change the path color. Here is one example of events and scripting although it is quite dated. Carto.net has an interactive map example as well.
The SVG would look something like:
<path
style="fill:#800000;fill-opacity:1;display:inline"
d="m 422.43078,517.40746 c 0.52151,0.006 1.10755,0.0374 1.75925,0.0825 3.82011,0.26462 5.01088,0.75501 5.75001,2.37491 0.51312,1.12355 2.4121,3.0097 4.22213,4.1946 3.906,2.55656 7.38824,2.07964 9.61517,-1.3194 2.12996,-3.25075 9.13451,-3.19196 13.61739,0.11545 1.77185,1.30707 4.04994,2.38037 5.06319,2.38041 1.01325,0 3.34593,0.92548 5.18421,2.06155 2.52816,1.56236 4.9918,2.09869 10.09889,2.19902 3.71359,0.0729 7.68145,0.64349 8.82374,1.26442 2.81717,1.53202 5.67633,1.42382 10.7693,-0.40133 4.97461,-1.78261 6.31161,-1.36525 17.10267,5.31063 3.39862,2.10239 6.90491,4.08094 7.7956,4.39801 2.46593,0.8776 4.55428,4.66976 3.95259,7.17971 -0.29359,1.22605 -0.75898,3.51121 -1.03349,5.07968 -0.27411,1.56855 -0.88382,3.33952 -1.35761,3.93621 -1.50842,1.89871 -20.98501,7.77151 -27.8945,8.41122 -3.66014,0.33879 -8.3091,1.04337 -10.32987,1.56676 -3.50666,0.90799 -3.81743,0.79746 -6.78388,-2.44089 -3.3486,-3.65594 -6.11308,-4.2716 -8.48815,-1.89661 -2.14408,2.14401 -1.85126,3.96434 1.0667,6.66846 1.40725,1.30409 1.85699,2.10446 1.00027,1.77571 -0.85672,-0.32883 -6.3937,-0.12213 -12.3033,0.46176 -5.9096,0.58386 -12.56062,1.27336 -14.78297,1.53381 -4.17058,0.4888 -5.09869,-0.37014 -2.61673,-2.42989 2.1563,-1.78956 1.74245,-2.63318 -1.65999,-3.36449 -1.69931,-0.36525 -4.94789,-1.90738 -7.213,-3.42496 -2.26473,-1.51754 -5.89662,-3.66823 -8.07583,-4.77731 -2.17921,-1.10923 -6.21922,-3.94186 -8.97721,-6.29463 -4.75318,-4.05478 -4.93682,-4.36681 -3.43604,-6.02527 0.96935,-1.07117 2.36209,-1.56397 3.5899,-1.26992 1.62639,0.38937 2.49494,-0.41237 4.59588,-4.24958 1.42481,-2.60257 2.23686,-4.95457 1.80316,-5.22266 -0.4337,-0.26805 -1.06784,-3.14557 -1.40725,-6.39358 -0.33978,-3.24797 -1.19001,-6.79064 -1.89134,-7.87242 -1.74322,-2.68957 -1.2114,-3.65437 2.44111,-3.61188 l 0,0 z"
id="cah"
inkscape:label="#cah"
onmouseover="highlightRegion(evt);"
onmouseout="restoreRegion(evt);" />
For any automation with the SVG file, I would use Inkscape extensions. Look at the Inkscape wiki under the Developer Tutorials / Extensions. Otherwise, SVG is still XML so if you have named your language regions in the source file with a distinguishing name, you could use Python to parse the XML and save each path/language region to a separate file.