Update how-to.md

update video URLs again

en/how-to.md

@@ -26,7 +26,7 @@ You can suggest or add a collection or an institution to GRSciColl here:
 When creating a new entry in GRSciColl, very few fields are mandatory. However, we really appreciate if you could provide the address for the entry you created (especially the country).
 
 See also this short video tutorial:
-<iframe title="vimeo-player" src="https://vimeo.com/showcase/10709937/video/649977782?h=fb1d926798" width="640" height="360" frameborder="0"    allowfullscreen></iframe>
+<iframe title="vimeo-player" src="https://player.vimeo.com/video/649977782?h=fb1d926798" width="640" height="360" frameborder="0"    allowfullscreen></iframe>
 
 If you can't access Vimeo in your country, [here](https://www.youtube.com/watch?v=R6ftJ61oOn4) is the YouTube video
 
@@ -38,7 +38,7 @@ There are three ways to update information on GRSciColl:
 * you can import data
 
 See also this short video tutorial:
-<iframe title="vimeo-player" src="https://vimeo.com/showcase/10709937/video/649977825?h=a0068cfcd8" width="640" height="360" frameborder="0"    allowfullscreen></iframe>
+<iframe title="vimeo-player" src="https://player.vimeo.com/video/649977825?h=a0068cfcd8" width="640" height="360" frameborder="0"    allowfullscreen></iframe>
 
 If you can't access Vimeo in your country, [here](https://www.youtube.com/watch?v=rgMQK9qFVfs) is the YouTube video