de: fix "k-th root"

Rules/Languages/de/ClearSpeak_Rules.yaml

@@ -90,7 +90,7 @@
           if: "*[2][self::m:mi][string-length(.)=1]"
           then:
           - x: "*[2]"
-          - pronounce: [text: "-th", ipa: "θ", sapi5: "th", eloquence: "T"]
+          - pronounce: [text: "-te", ipa: "te", sapi5: "te", eloquence: "T"]
           else: [x: "*[2]"]
       - T: "wurzel"
   - test:

Rules/Languages/de/SimpleSpeak_Rules.yaml

@@ -66,7 +66,7 @@
           if: "*[2][self::m:mi][string-length(.)=1]"
           then:
           - x: "*[2]"
-          - pronounce: [text: "-th", ipa: "θ", sapi5: "th", eloquence: "T"]
+          - pronounce: [text: "-te", ipa: "te", sapi5: "te", eloquence: "T"]
           else: [x: "*[2]"]
       - T: "wurzel"        # phrase(the square 'root' of)
   - test:

tests/Languages/de/ClearSpeak/mroot.rs

@@ -119,17 +119,25 @@ fn ordinal_root() -> Result<()> {
 }
 
 
-/* // should have n-te wurze
 #[test]
-fn simple_mi_root() -> Result<()> {
+fn variable_root_index_uses_german_ordinal_suffix() -> Result<()> {
+    // A variable root index uses the German ordinal suffix in both speech styles.
     let expr = "<math>
                     <mroot> <mi>x</mi> <mi>n</mi> </mroot>
                 </math>";
-    test("de", "ClearSpeak", expr, "die n-th wurzel von x")?;
+    test("de", "ClearSpeak", expr, "die n-te wurzel von x")?;
+    test("de", "SimpleSpeak", expr, "die n-te wurzel von x")?;
+
+    let expr = "<math>
+                    <mroot> <mi>x</mi> <mi>k</mi> </mroot>
+                </math>";
+    test("de", "ClearSpeak", expr, "die k-te wurzel von x")?;
+    test("de", "SimpleSpeak", expr, "die k-te wurzel von x")?;
     return Ok(());
 
 }
 
+/*
 #[test]
 fn mroot_simple_pos_end_root() -> Result<()> {
     let expr = "<math>