text: Don't say that dashes are allowed. (#1247)

* text: Don't say that dashes are allowed.

This was missed in https://github.com/pybricks/pybricks-code/commit/8b19ad58662186d2295a6241e8c3f84fbfd45809

* explorer/fileNameForGroup: remove dash from translaction dict

Co-authored-by: David Lechner <david@lechnology.com>

src/explorer/fileNameFormGroup/FileNameFormGroup.tsx

@@ -119,7 +119,6 @@ const FileNameHelpText: React.VoidFunctionComponent<FileNameHelpTextProps> = ({
                     {i18n.translate('helpText.hasInvalidCharacters', {
                         letters: <Code className={Classes.CODE}>a…z</Code>,
                         numbers: <Code className={Classes.CODE}>0…9</Code>,
-                        dash: <Code className={Classes.CODE}>-</Code>,
                         underscore: <Code className={Classes.CODE}>_</Code>,
                     })}{' '}
                     <FixItButton onPress={handleHasInvalidCharacters} />

src/explorer/fileNameFormGroup/translations/en.json

@@ -6,7 +6,7 @@
         "hasSpaces": "File name cannot have spaces.",
         "hasFileExtension": "The file extension will be added automatically.",
         "hasInvalidFirstCharacter": "File name must start with a letter ({letters}) or underscore ({underscore}).",
-        "hasInvalidCharacters": "File name can only contain letters ({letters}), numbers ({numbers}), dashes ({dash}) and underscores ({underscore}).",
+        "hasInvalidCharacters": "File name can only contain letters ({letters}), numbers ({numbers}) and underscores ({underscore}).",
         "alreadyExists": "A file with this name already exists. Try a different name.",
         "fixIt": "Fix it for me."
     }