fix: shorter template name due to Triangle max character limit

FESOM2_MeshGen_{{cookiecutter.mesh_name}}/bin/showme

FESOM2_MeshGen_{{cookiecutter.mesh_name}}/bin/triangle

...esh_name}}/mesh_CORE2_{{cookiecutter.mesh_name}}/Makefile

...}}/mesh_CORE2_{{cookiecutter.mesh_name}}/global_mesh.poly

...mesh_CORE2_{{cookiecutter.mesh_name}}/mesh_parameters.txt

...me}}/mesh_CORE2_{{cookiecutter.mesh_name}}/namelist.relax

...E2_{{cookiecutter.mesh_name}}/polygons/atlantic_north.txt

...2_{{cookiecutter.mesh_name}}/polygons/atlantic_north2.txt

...esh_CORE2_{{cookiecutter.mesh_name}}/polygons/baltic1.txt

...esh_CORE2_{{cookiecutter.mesh_name}}/polygons/baltic2.txt

...CORE2_{{cookiecutter.mesh_name}}/polygons/bering_line.txt

...E2_{{cookiecutter.mesh_name}}/polygons/bering_lt60_65.txt

...2_{{cookiecutter.mesh_name}}/polygons/bering_lt60_65.txt~

...E2_{{cookiecutter.mesh_name}}/polygons/east_greenland.png

...E2_{{cookiecutter.mesh_name}}/polygons/east_greenland.txt

...h_CORE2_{{cookiecutter.mesh_name}}/polygons/gibraltar.txt

...CORE2_{{cookiecutter.mesh_name}}/polygons/poly_caa_hr.txt

...ORE2_{{cookiecutter.mesh_name}}/polygons/poly_caa_hr.txt~

...E2_{{cookiecutter.mesh_name}}/polygons/polygon_Baltic.txt

...{{cookiecutter.mesh_name}}/polygons/polygon_BeringSea.txt