Añadir explicacion de como cambiar capa base del visor de GIS

[Xevib]

Description:

Description of the docs to add/modify

Tasks:

• [x] Añadir explicacion
• [x] Traducir

Links:

Add links for each file modified

• CA
• ES

[jaumef]

Fer Merge amb master abans de continuar

[jaumef]

fix conflicts

[giscegit]

Documentation build URL: http://builds.gisce.net/powerp-docs/powerp_add_webgis_layer/

Things to review:

• [x] Typos in Catalan
• [x] Typos in Spanish
• [x] Links routes in Spanish
• [x] Links work in Catalan
• [x] Links work in Spanish
• [x] Images in Spanish
• [x] Page index shows all headers

[jaumef]

@Xevib fix conflicts and resolve revision changes

[jaumef]

@Xevib Si està discontinuada la tanquem, ja que està quedant endarrerit