Improve post-petition signature emails

templates/email/SPB_petition_signature_thanks.html

 <p>Many thanks for signing the petition!</p>
+<p>One quick and easy way to help us further is to get your colleagues to also sign. Please consider doing this, via word-of-mouth or email!</p>
 <p>
-  If you have not done so already, you can really further help SciPost convince
+  One less quick but even more effective way to further help SciPost convince
   your institution, library and/or funding agency to become Supporting Partners
-  by sending a personalized email to one of their representatives; you can use our
+  is to send a personalized email to one of their representatives; you can use our
   <a href="mailto:?subject=Petition to support SciPost&amp;body=[PLEASE FILL IN THE TO FIELD ABOVE (keeping partners@scipost.org in cc)]%0D%0A%0D%0ADear ...%0D%0A%0D%0A[PLEASE WRITE A PERSONALIZED MESSAGE]%0D%0A%0D%0AHere under, you will find basic information about SciPost and how you can support it.%0D%0A%0D%0ASincerely,%0D%0A[YOUR SIGNATURE]%0D%0A%0D%0A%0D%0A%0D%0ASciPost (https://scipost.org) is a top-quality next-generation Open Access publication portal managed by professional scientists. Its principles, ideals and implementation can be found at https://scipost.org/about and https://scipost.org/FAQ.%0D%0A%0D%0ASciPost follows a different funding model than most traditional publishers. It operates on an entirely not-for-profit basis, and charges neither subscription fees nor article processing charges; instead, its activities are financed through a cost-slashing consortial model.%0D%0A%0D%0ABy making a small financial commitment, the institutions and organizations that benefit from SciPost’s activities can become Supporting Partners. This enables SciPost to perform all of its publication-related activities, maintain its online portal and implement its long-term development plan. Details of the consortial funding scheme and how to join can be found at https://scipost.org/partners or by emailing partners@scipost.org.%0D%0A&amp;cc=partners@scipost.org">template</a> as a start.</p>
 <p>
   You can also point them towards details of our consortial funding scheme on our <a href="https://scipost.org/partners">Partners page</a>, and our <a href="https://scipost.org/static/scipost/SPB/SciPost_Supporting_Partners_Board_Prospectus.pdf">one-page Prospectus</a> summarizing the scheme, which is expounded in detail in the draft <a href="https://scipost.org/static/scipost/SPB/SciPost_Supporting_Partner_Agreement.pdf">Partner Agreement</a>.

templates/email/SPB_petition_signature_thanks.txt

 Many thanks for signing the petition!\n\n
-If you have not done so already, you can really further help SciPost convince
-your institution, library and/or funding agency to become Supporting Partners
-by sending a personalized email to one of their representatives; we have a
-handy email template for you to use at https://scipost.org/partners/.\n\n
+One quick and easy way to help us further is to get your colleagues to also sign. We'd be grateful if you considered doing this, via word-of-mouth or email!\n\n
+One less quick but even more effective way to further help SciPost convince your institution, library and/or funding agency to become Supporting Partners is to send a personalized email to one of their representatives; we have a handy email template for you to use at https://scipost.org/partners/.\n\n
 You can also point them to our prospectus and draft agreement on that same
 page.\n\nWe are very grateful for your help.\n\nThe SciPost Team