fixed more "hz" typos

locale/lang-ca.js

@@ -2509,7 +2509,7 @@ SnapTranslator.dict.ca = {
     'max':
         'màxima',
 //
-    'play %n hz for %n secs':
+    'play %n Hz for %n secs':
         'toca %n Hz durant %n segons',
 //libreries
     'Text Costumes':
@@ -2633,8 +2633,8 @@ SnapTranslator.dict.ca = {
         'fixa el balanç a %n',
     'balance':
         'balanç',
-    'play frequency %n hz':
-        'toca la freqüència %n hz',
+    'play frequency %n Hz':
+        'toca la freqüència %n Hz',
     'stop frequency':
         'atura la freqüència',
     'pen %pen':

locale/lang-de.js

@@ -433,12 +433,12 @@ SnapTranslator.dict.de = {
         'setze Balance auf %n',
     'balance':
         'Balance',
-    'play frequency %n hz':
-        'spiele Frequenz %n hz',
+    'play frequency %n Hz':
+        'spiele Frequenz %n Hz',
     'stop frequency':
         'stoppe Frequenz',
-    'play %n hz for %n secs':
-        'spiele %n hz f\u00fcr %n Sek.',
+    'play %n Hz for %n secs':
+        'spiele %n Hz f\u00fcr %n Sek.',
 
     // "instruments", i.e. wave forms
     '(1) sine':

src/objects.js

@@ -484,7 +484,7 @@ SpriteMorph.prototype.initBlocks = function () {
             dev: true,
             type: 'command',
             category: 'sound',
-            spec: 'play %n hz for %n secs',
+            spec: 'play %n Hz for %n secs',
             defaults: [440, 2]
         },
         doSetInstrument: {
@@ -547,7 +547,7 @@ SpriteMorph.prototype.initBlocks = function () {
         playFreq: {
             type: 'command',
             category: 'sound',
-            spec: 'play frequency %n hz',
+            spec: 'play frequency %n Hz',
             defaults: [440]
         },
         stopFreq: {