Make database warning translatable
Improve Private Feed setting description.

This is how they do it in core :wink:
Fix activity widget text
Fix header text of select elements on the list table

Was #172
Use _x() instead of __() appropriately

This will give translators better context
Provide .pot file

This file should be used by translators to update their translations.

For example, using POEdit:
1. Fire up POEdit
2. Open your language's current .po file
3. Click **Catalog** > **Update from POT file**
4. Translate away and save.
Update .po file based on new .pot
Indonesian Translation

Depends on #176
Update Polish language to use new placeholders
Adding custom style to Stream Datepicker
Fixing phpcs error
Font family, font size and color tweaks
Cell padding and color tweak
Stay within the official fresh scheme
Filter out keys with empty values
Check for existence of a defined character set in table creation SQL

Resolves #233
Only filter null values
Apply charset fix on rest of the tables
Fallback to null values for $network_wide message
Fix array filter to remove only null value