fix: parsing of @ in i18n values (#10334)

Vue i18n has a new [linked message
syntax.](https://vue-i18n.intlify.dev/guide/essentials/syntax.html#linked-messages)
When it encounters `@` it assumes that we're trying to use a linked
message. And tries to parse it as such, in any case, it breaks since the
syntax is not valid and the params are not present. So it causes an
error. This works on dev but on production the error is bubbled up to
the top and rendering breaks.

A lot of folks use Chatwoot with default locale set in the env, this
surfaced the issue for the languages for which the syntax was not
updated

Fixes: https://github.com/chatwoot/chatwoot/issues/10313

app/javascript/dashboard/i18n/locale/cs/login.json

@@ -3,7 +3,7 @@
     "TITLE": "Přihlásit se do Chatwoot",
     "EMAIL": {
       "LABEL": "E-mailová adresa",
-      "PLACEHOLDER": "E-mail např: někdo@example.com",
+      "PLACEHOLDER": "E-mail např: někdo{'@'}example.com",
       "ERROR": "Zadejte prosím platnou e-mailovou adresu"
     },
     "PASSWORD": {

app/javascript/dashboard/i18n/locale/cs/signup.json

@@ -20,7 +20,7 @@
     },
     "EMAIL": {
       "LABEL": "Pracovní e-mail",
-      "PLACEHOLDER": "Zadejte svou pracovní e-mailovou adresu. např.: jan@novak.spolecnost",
+      "PLACEHOLDER": "Zadejte svou pracovní e-mailovou adresu. např.: jan{'@'}novak.spolecnost",
       "ERROR": "Please enter a valid work email address"
     },
     "PASSWORD": {