Small corrections to the math dialog menu

Remove some duplicated symbols and correct some typos

Change-Id: I41e98a7b80554f3332e9abff33b9d12701a5d855

modules/ve-math/symbols.json

@@ -377,10 +377,6 @@
             "insert": "\\backprime",
             "tex": "\\backprime"
         },
-        {
-            "insert": "f^\\prime",
-            "tex": "f^\\prime"
-        },
         {
             "insert": "f'",
             "tex": "f'"
@@ -392,9 +388,9 @@
         {
             "tex": "f^{(3)}",
             "encapsulate": {
-                "pre": "f^{",
+                "pre": "f^{(",
                 "placeholder": "3",
-                "post": "}"
+                "post": ")}"
             }
         },
         {
@@ -484,11 +480,11 @@
         },
         {
             "wide": true,
-            "tex": "a\\,\\bmod\\,b",
+            "tex": "a\\bmod b",
             "encapsulate": {
                 "pre": "",
                 "placeholder": "a",
-                "post": "\\,\\bmod\\,b"
+                "post": "\\bmod b"
             }
         },
         {
@@ -1443,38 +1439,6 @@
             "insert": "\\bigwedge",
             "tex": "\\bigwedge"
         },
-        {
-            "tex": "\\bar{q}",
-            "encapsulate": {
-                "pre": "\\bar{",
-                "placeholder": "q",
-                "post": "}"
-            }
-        },
-        {
-            "tex": "\\bar{abc}",
-            "encapsulate": {
-                "pre": "\\bar{",
-                "placeholder": "abc",
-                "post": "}"
-            }
-        },
-        {
-            "tex": "\\overline{q}",
-            "encapsulate": {
-                "pre": "\\overline{",
-                "placeholder": "q",
-                "post": "}"
-            }
-        },
-        {
-            "tex": "\\overline{abc}",
-            "encapsulate": {
-                "pre": "\\overline{",
-                "placeholder": "abc",
-                "post": "}"
-            }
-        },
         {
             "insert": "\\vdash",
             "tex": "\\vdash"