FEM: Fix cxx typo and remove calculix from solvers tab in examples (#12876)

* FEM: remove calculix from solvers

* FEM: remove calculix from joint with ccxtools if branches

* FEM: remove calculix from its if

* FEM: fix cxx typo in translations

* FEM: fix cxx typo in classes name

* FEM: fix ccx typo in shortcuts

* FEM: convert FEM_*CcxTools to CamelCase

* FEM: remove tests related to calculix

* FEM: remove test_solver_calculix.py from Fem/CMakeLists.txt

* FEM: convert all 'CalculiXccxTools' to 'CalculiXCcxTools'

* FEM: revert changes in all *_*.ts files

* FEM: convert 'SolverCcxtools' to 'SolverCcxTools'

* FEM: convert remaining 'Ccxtools' to 'CcxTools'

src/Mod/Fem/femexamples/boxanalysis_frequency.py

@@ -35,7 +35,7 @@ def get_information():
         "meshtype": "solid",
         "meshelement": "Tet10",
         "constraints": [],
-        "solvers": ["calculix", "ccxtools"],
+        "solvers": ["ccxtools"],
         "material": "solid",
         "equations": ["frequency"]
     }
@@ -70,12 +70,10 @@ def setup(doc=None, solvertype="ccxtools"):
     analysis = doc.Analysis
 
     # solver
-    if solvertype == "calculix":
-        solver_obj = ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
-    elif solvertype == "ccxtools":
-        solver_obj = ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
+    if solvertype == "ccxtools":
+        solver_obj = ObjectsFem.makeSolverCalculiXCcxTools(doc, "CalculiXCcxTools")
         solver_obj.WorkingDir = u""
-    if solvertype == "calculix" or solvertype == "ccxtools":
+    if solvertype == "ccxtools":
         solver_obj.AnalysisType = "frequency"
         solver_obj.GeometricalNonlinearity = "linear"
         solver_obj.ThermoMechSteadyState = False