[FIX] compiler: call translate function with correct string

Before this commit, the parser would remove all consecutive white spaces
for text nodes. After that, the code generator would call the translate
function with the resulting string, which then is different than what we
would expect.

With this commit, we make sure we apply the translation before removing
the additional whitespace. To do that, we have to move the code
processing the string from the parser into the code generator, which
actually makes sense, as the parser should only collect all useful
information without applying too much logic.

closes #1351

tests/compiler/parser.test.ts

@@ -26,10 +26,10 @@ describe("qweb parser", () => {
     });
   });
 
-  test("white spaces are condensed into a single space", async () => {
+  test("white spaces are maintained", async () => {
     expect(parse("   ")).toEqual({
       type: ASTType.Text,
-      value: " ",
+      value: "   ",
     });
   });