Security PREREQUISITES

( You are warned that you must know something about php to modify these files )

* copy these 3 files to xxxold.php
( so we have the duplicates of these files to restore them before any error )

 oc-admin / themes / omega / items / frm.php
 oc-content / themes / sigma / user-profile.php
 oc-content / themes / sigma / item-sidebar.php

those files should be read like this

 oc-admin / themes / omega / items / frmold.php
 oc-content / themes / sigma / user-profileold.php
 oc-content / themes / sigma / item-sidebarold.php

1.MODIFYING "other contact" for "whatsapp" in THE OMEGA THEME oc-admin
enter this file
 oc-admin / themes / omega / items / frm.php

Look for
  <div class="input-has-placeholder input-separate-top">
        <label><?php _e('Other Contact'); ?></label>
        <?php ItemForm::contact_other_text(); ?>
  </div>
modify by this
  <div class="input-has-placeholder input-separate-top">
        <label><?php _e('Whatsapp'); ?></label>
        <?php ItemForm::contact_other_text(); ?>
  </div>

2. IN THE user-profile.php
enter this file
 oc-content / themes / sigma / user-profile.php

Look for
  <div class="control-group">
     <label class="control-label" for="phoneLand"><?php _e('Phone', 'sigma'); ?></label>
  <div class="controls">
modify by this
  <div class="control-group">
     <label class="control-label" for="phoneLand"><?php _e('Whatsapp', 'sigma'); ?></label>
  <div class="controls">

3.IN THE item-sidebar.php
enter this file
 oc-content / themes / sigma / item-sidebar.php

Look for
   <?php if ( osc_item_contact_other() != '' ) { ?>
      <p class="other bld"><span><?php _e('Other', 'sigma'); ?>:</span> <?php echo osc_item_contact_other(); ?></p>
   <?php } ?>
Modify by this
   <?php if ( osc_item_contact_other() != '' ) { ?>
      <p class="other bld"><span><?php _e('Whatsapp', 'sigma'); ?>:</span> <a class="other bld" title="Whatsapp" target="_blank" href="https://wa.me/<?php echo osc_item_contact_other(); ?>"><i class="fa fa-whatsapp"></i></a></p>
   <?php } ?>

* You remember that if you update the SIGMA theme  these modifications will be deleted.

@Gimenez70
Thanks for nice guide, just one comment to changing strings.
This is not required to do in theme/core files, simply update translation to have i.e. "Whatsapp" instead of "Other contact", even English to English will work nicely.

@Gimenez70
Thanks for nice guide, just one comment to changing strings.
This is not required to do in theme/core files, simply update translation to have i.e. "Whatsapp" instead of "Other contact", even English to English will work nicely.

Thank You MB ..