Made the migration shell messages more clear by adding quotes and the word table

For example before it was:
'Changing field class from schema_migrations.'
 Now it is:
 'Changing field "class" from table "schema_migrations".'
Regenerated migrations.pot file
Updated deu locale from POT file

Improved some translation strings.
Updated fre locale from POT file
Updated ita locale from POT file
Updated por locale from POT file
Updated spa locale from POT file

Fixed "Plural-Forms:" string.
Improved POT file header
Updated PO file headers from POT file
Set up some .gitignore rules
Added .idea to .gitignore
Removed superfluous translation call

Updated POT and PO files
Removed disabled translations in PO files
Merge pull request #176 from ravage84/shell-messages-quotes

Made the migration shell messages more clear