[Tails-l10n] Is it safe to change the value field of submit …

Hi,

I'm in the process of reviewing a translation for the donation page[0]
which has some input fields. Most of these have <label>..</label> tags
and are fine but what about the submit buttons?

        <input class="button" type="submit" value="Subscribe" />

Is it safe to change (e.g., translate) the value field, or will this
break the CGI script from paypal or something else?

        <input class="button" type="submit" value="XXXXXX" />

(FYI: on the French version, it is translated)

~flapflap

[0] https://tails.boum.org/contribute/how/donate/index.en.html