[Techdraw] Import SVG files with UTF-8 encoding (#18816)

* [Techdraw] Fix importing SVG files with UTF-8 encoding

* [Techdraw] fix Lint feedback

src/Mod/TechDraw/TDTest/DrawViewSymbolTest.py

@@ -1,5 +1,6 @@
 
 import FreeCAD
+import codecs
 import os
 import unittest
 from .TechDrawTestUtilities import createPageWithSVGTemplate
@@ -21,7 +22,26 @@ class DrawViewSymbolTest(unittest.TestCase):
         sym = FreeCAD.ActiveDocument.addObject("TechDraw::DrawViewSymbol", "TestSymbol")
         path = os.path.dirname(os.path.abspath(__file__))
         symbolFileSpec = path + "/TestSymbol.svg"
-        f = open(symbolFileSpec, "r")
+        f = codecs.open(symbolFileSpec, "r", encoding="utf-8")
+        svg = f.read()
+        f.close()
+        sym.Symbol = svg
+        self.page.addView(sym)
+        sym.X = 220.0
+        sym.Y = 150.0
+
+        FreeCAD.ActiveDocument.recompute()
+
+        self.assertTrue("Up-to-date" in sym.State)
+
+    def testNonAsciiSymbol(self):
+        """Tests if a Non-Ascii symbol can be added to page"""
+        sym = FreeCAD.ActiveDocument.addObject(
+            "TechDraw::DrawViewSymbol", "NonAsciiSymbol"
+        )
+        path = os.path.dirname(os.path.abspath(__file__))
+        symbolFileSpec = path + "/TestNonAsciiSymbol.svg"
+        f = codecs.open(symbolFileSpec, "r", encoding="utf-8")
         svg = f.read()
         f.close()
         sym.Symbol = svg
@@ -34,5 +54,6 @@ class DrawViewSymbolTest(unittest.TestCase):
         self.assertTrue("Up-to-date" in sym.State)
 
 
+
 if __name__ == "__main__":
     unittest.main()