[FIX] properly translate terms surrounded by spaces

This reimplements logic from Odoo v13 [1], i.e. if we have a text that follows
by space e.g. "This database will expire in " [2], then we want get translation
for the term without that space and add the space manually. This way we can
export trimmed terms for translations and don't miss the space, when atranslator
forget to add it at the end of translation

[1] https://github.com/odoo/odoo/blob/26927417e2957acba6fb79446c2520107daa7eea/addons/web/static/src/js/core/qweb.js#L46
[2] https://github.com/odoo/enterprise/blob/ab0e893493f909ec3033e8a1cf6c141ea9375587/web_enterprise/static/src/xml/base.xml#L21

---

opw-2410708

src/qweb/qweb.ts

@@ -70,6 +70,7 @@ const TRANSLATABLE_ATTRS = ["label", "title", "placeholder", "alt"];
 
 const lineBreakRE = /[\r\n]/;
 const whitespaceRE = /\s+/g;
+const translationRE = /^(\s*)([\s\S]+?)(\s*)$/;
 
 const NODE_HOOKS_PARAMS = {
   create: "(_, n)",
@@ -496,7 +497,8 @@ export class QWeb extends EventBus {
       }
       if (this.translateFn) {
         if ((node.parentNode as any).getAttribute("t-translation") !== "off") {
-          text = this.translateFn(text);
+          const match = translationRE.exec(text);
+          text = match[1] + this.translateFn(match[2]) + match[3];
         }
       }
       if (ctx.parentNode) {