chore: update interpolation syntax for i18n files (#10198)

There were two warnings showing up on new teams page

1. `errorMessage` prop was getting invalid value, this was because were
short circuting the error message using `&&`, fixed it by using ternary
operator
2. `vue-i18n` has deprecated [rails
syntax](https://vue-i18n.intlify.dev/guide/essentials/syntax#rails-i18n-format),
fixed that warning by removing `%` before `{}` for interpolation

> Note: the `vue-i18n` deprecation needs to be handled, but we can do it
later

app/javascript/dashboard/i18n/locale/sl/helpCenter.json

@@ -84,7 +84,7 @@
     },
     "ARTICLE_SEARCH_RESULT": {
       "UNCATEGORIZED": "Uncategorized",
-      "SEARCH_RESULTS": "Search results for %{query}",
+      "SEARCH_RESULTS": "Search results for {query}",
       "EMPTY_TEXT": "Search for articles to insert into replies.",
       "SEARCH_LOADER": "Searching...",
       "INSERT_ARTICLE": "Insert",
@@ -250,13 +250,13 @@
         "DOMAIN": {
           "LABEL": "Custom Domain",
           "PLACEHOLDER": "Portal custom domain",
-          "HELP_TEXT": "Add only If you want to use a custom domain for your portals. Eg: %{exampleURL}",
+          "HELP_TEXT": "Add only If you want to use a custom domain for your portals. Eg: {exampleURL}",
           "ERROR": "Enter a valid domain URL"
         },
         "HOME_PAGE_LINK": {
           "LABEL": "Home Page Link",
           "PLACEHOLDER": "Portal home page link",
-          "HELP_TEXT": "The link used to return from the portal to the home page. Eg: %{exampleURL}",
+          "HELP_TEXT": "The link used to return from the portal to the home page. Eg: {exampleURL}",
           "ERROR": "Enter a valid home page URL"
         },
         "THEME_COLOR": {