Most of the language strings for UpStream are in the main language file in /wp-content/plugins/upstream/languages/upstream.po
However, some strings are in different locations. In particular, make sure to check these three things:
- UpStream uses some strings from the WordPress core. If you want UpStream to be in Spanish, make sure you have Spanish installed for the WordPress core.
- Some strings are inside UpStream extensions. Look for the language strings inside UpStream extensions.
- UpStream allows you to change some strings from the user interface. Look for language strings by going to UpStream > General, and finding these settings:
Deprecated: preg_split(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/www/upstream/wp-includes/formatting.php on line 616
Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/www/upstream/wp-includes/class-wp-embed.php on line 446
Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /var/www/upstream/wp-includes/class-wp-embed.php on line 454