add translated string support

src/grammar.json

@@ -127,6 +127,10 @@
             {
               "type": "SYMBOL",
               "name": "string"
+            },
+            {
+              "type": "SYMBOL",
+              "name": "translated_string"
             }
           ]
         },
@@ -144,6 +148,34 @@
       "type": "PATTERN",
       "value": "\"(?:[^\"\\\\]|\\\\[^\\n])*\"|'(?:[^'\\\\]|\\\\[^\\n])*'"
     },
+    "translated_string": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "_("
+        },
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "IMMEDIATE_TOKEN",
+            "content": {
+              "type": "PATTERN",
+              "value": "\"(?:[^\"\\\\]|\\\\[^\\n])*\"|'(?:[^'\\\\]|\\\\[^\\n])*'"
+            }
+          },
+          "named": true,
+          "value": "string"
+        },
+        {
+          "type": "IMMEDIATE_TOKEN",
+          "content": {
+            "type": "STRING",
+            "value": ")"
+          }
+        }
+      ]
+    },
     "attribute": {
       "type": "PATTERN",
       "value": "[a-zA-Z0-9][a-zA-Z0-9_]*(?:\\.[a-zA-Z0-9][a-zA-Z0-9_]*)*"

src/node-types.json

@@ -657,6 +657,10 @@
         {
           "type": "string",
           "named": true
+        },
+        {
+          "type": "translated_string",
+          "named": true
         }
       ]
     }
@@ -1018,6 +1022,21 @@
       ]
     }
   },
+  {
+    "type": "translated_string",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": false,
+      "required": true,
+      "types": [
+        {
+          "type": "string",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "url_block",
     "named": true,
@@ -1230,6 +1249,10 @@
     "type": "%}",
     "named": false
   },
+  {
+    "type": ")",
+    "named": false
+  },
   {
     "type": ",",
     "named": false
@@ -1262,6 +1285,10 @@
     "type": ">=",
     "named": false
   },
+  {
+    "type": "_(",
+    "named": false
+  },
   {
     "type": "add:",
     "named": false