Removing unnecessary strings from Crowdin + improving typos

patches for #10459 and #10426...
a few small details escaped attention need to be fixed
😉
Removing unnecessary strings from Crowdin and improving typos.

src/Mod/Draft/Resources/ui/TaskPanel_CircularArray.ui

@@ -41,7 +41,7 @@
       <item row="0" column="0">
        <widget class="QLabel" name="label_icon">
         <property name="text">
-         <string>(Placeholder for the icon)</string>
+         <string notr="true">(Placeholder for the icon)</string>
         </property>
        </widget>
       </item>

src/Mod/Fem/femcommands/commands.py

@@ -210,7 +210,7 @@ class _ConstraintCentrif(CommandManager):
         super(_ConstraintCentrif, self).__init__()
         self.menutext = Qt.QT_TRANSLATE_NOOP(
             "FEM_ConstraintCentrif",
-            "Centrifigual load"
+            "Centrifugal load"
         )
         self.tooltip = Qt.QT_TRANSLATE_NOOP(
             "FEM_ConstraintCentrif",