fix(rules): Change "alternate text" to "alternative text" (#4582)

It should be alternative text, not alternate text. 

Closes:

Author: umut-gultekin

lib/rules/area-alt.json

@@ -19,8 +19,8 @@
   ],
   "actIds": ["c487ae"],
   "metadata": {
-    "description": "Ensure <area> elements of image maps have alternate text",
-    "help": "Active <area> elements must have alternate text"
+    "description": "Ensure <area> elements of image maps have alternative text",
+    "help": "Active <area> elements must have alternative text"
   },
   "all": [],
   "any": ["non-empty-alt", "aria-label", "aria-labelledby", "non-empty-title"],

lib/rules/image-alt.json

@@ -18,8 +18,8 @@
   ],
   "actIds": ["23a2a8"],
   "metadata": {
-    "description": "Ensure <img> elements have alternate text or a role of none or presentation",
-    "help": "Images must have alternate text"
+    "description": "Ensure <img> elements have alternative text or a role of none or presentation",
+    "help": "Images must have alternative text"
   },
   "all": [],
   "any": [

lib/rules/input-image-alt.json

@@ -19,8 +19,8 @@
   ],
   "actIds": ["59796f"],
   "metadata": {
-    "description": "Ensure <input type=\"image\"> elements have alternate text",
-    "help": "Image buttons must have alternate text"
+    "description": "Ensure <input type=\"image\"> elements have alternative text",
+    "help": "Image buttons must have alternative text"
   },
   "all": [],
   "any": ["non-empty-alt", "aria-label", "aria-labelledby", "non-empty-title"],

lib/rules/object-alt.json

@@ -14,8 +14,8 @@
   ],
   "actIds": ["8fc3b6"],
   "metadata": {
-    "description": "Ensure <object> elements have alternate text",
-    "help": "<object> elements must have alternate text"
+    "description": "Ensure <object> elements have alternative text",
+    "help": "<object> elements must have alternative text"
   },
   "all": [],
   "any": [

lib/rules/role-img-alt.json

@@ -17,7 +17,7 @@
   ],
   "actIds": ["23a2a8"],
   "metadata": {
-    "description": "Ensure [role=\"img\"] elements have alternate text",
+    "description": "Ensure [role=\"img\"] elements have alternative text",
     "help": "[role=\"img\"] elements must have an alternative text"
   },
   "all": [],