Change ui language to reflect functionality now (layers)

[aymanhab]

Names and icons changed to reflect layers functionality, need to review the translation and/or possibly change the strings in i18n.

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[AlbertoCasasOrtiz]

@aymanhab I just added/changes Spanish strings and added a tooltip for WCS (SCM in Spanish) to show its meaning.

[aymanhab]

Awesome, thanks @AlbertoCasasOrtiz