Update TUM address and RWTH name in group-locations.csv

2 minor issues with locations in Germany:

* Technical University Munich had coordinates pointing to Berlin.
Have replaced them with the address of the downtown Munich main building (no idea exactly which department it is, so I'm not going to try to be more precise).

* The name RWTH (abbrev. of "Rheinisch-Westfälische Technische Hochschule") was written as "RWTCH. Have fixed this typo.

_data/group-locations.csv

@@ -9,7 +9,7 @@ address,lat,lng,name,url
 "west milton, new york, united states",43.0375748,-73.9292912,Naval Nuclear Laboratory,https://navalnuclearlab.energy.gov/
 "kobe, japan",34.6932379,135.1943764,RIKEN Center for Computational Science,https://www.r-ccs.riken.jp/en/
 "paris, france",48.8534951,2.3483915,French Alternative Energies and Atomic Energy Commission (CEA),https://www.cea.fr/english
-"aachen, germany",50.776351,6.083862,"RWTCH Aachen University, German Research School for Simulation Sciences",https://www.aices.rwth-aachen.de/en/
+"aachen, germany",50.776351,6.083862,"RWTH Aachen University, German Research School for Simulation Sciences",https://www.aices.rwth-aachen.de/en/
 "cambridge, massachusetts, united states",42.3655767,-71.1040018,Massachusetts Institute of Technology,https://www.mit.edu/
 "champaign, illinois, united states",40.1164841,-88.2430932,Univeristy of illinois Urbana-Champaign,https://illinois.edu/
 "raleigh, north carolina, united states",35.7803977,-78.6390989,North Carolina State University,https://www.ncsu.edu/
@@ -24,7 +24,7 @@ address,lat,lng,name,url
 "eugene, oregon, united states",44.0505054,-123.0950506,University of Oregon,https://www.uoregon.edu/
 "chicago, illinois, united states",41.8755616,-87.6244212,Illinois Institute of Tech,https://www.iit.edu/
 "tuscon, arizona, united states",32.3090726,-111.0827253,University of Arizona,https://www.arizona.edu/
-"mã¼nchen, germany",52.5055795,13.5590615,Technical University Munich,https://www.tum.de/en/
+"mã¼nchen, germany",48.148056,11.568056,Technical University Munich,https://www.tum.de/en/
 "yorktown heights, new york, united states",41.2709274,-73.7776336,IBM TJ Watson Research Center,https://research.ibm.com/labs/watson/visitor.shtml
 "raleigh, north carolina, united states",35.7803977,-78.6390989,RedHat OpenShift,https://www.redhat.com/en
 "houston, texas, united states",29.7589382,-95.3676974,HPE,https://www.hpe.com/