fix: update invalid email text [DHIS2-15416] (#2550)

src/i18n/i18n_module_en.properties

@@ -276,7 +276,7 @@ value_should_be_empty_string_or_undefined=Value should be empty
 value_should_be_a_url=This field requires a valid url
 value_should_be_a_relative_url=This field requires a relative URL
 value_should_be_list_of_urls=This field requires a list of URLs
-value_should_be_an_email=This field contains an e-mail address
+value_should_be_an_email=This field should contain an e-mail address
 value_should_be_a_number=This field should contain a number
 number_should_not_have_decimals=The number should not have decimals
 value_not_max=The value is to long/large