Updated issue templates

Author: squidfunk

.github/ISSUE_TEMPLATE/01-report-a-bug.yml

@@ -83,10 +83,10 @@ body:
     attributes:
       label: Browser
       description: >-
-        If the bug only happens in __specific browsers__, please select them
-        from the dropdown below. If your browser is not listed or the version
-        is relevant, you may select _Other_ and provide more details in the
-        field above.
+        This field is optional. If the bug only happens in __specific browsers__,
+        please select them from the dropdown below. If your browser is not
+        listed or the version is relevant, you may select _Other_ and provide
+        more details in the field above.
         [More](https://squidfunk.github.io/mkdocs-material/contributing/reporting-a-bug/#browser)
       multiple: true
       options:

.github/ISSUE_TEMPLATE/04-add-translations.yml

@@ -85,9 +85,9 @@ body:
     attributes:
       label: Country flag
       description: >-
-        Please add the flag of the country when adding a new language. Go to our
-        [emoji search](https://squidfunk.github.io/mkdocs-material/reference/icons-emojis/#search)
-        and enter `flag`` to find all available shortcodes. If your flag is not
+        This field is optional. Please add the flag of the country when adding a
+        new language. Go to our [emoji search](https://squidfunk.github.io/mkdocs-material/reference/icons-emojis/#search)
+        and enter `flag` to find all available shortcodes. If your flag is not
         included, please choose the most appropriate available flag.
         [More](https://squidfunk.github.io/mkdocs-material/contributing/adding-translations/#country-flag)
       placeholder: |-