Update bills.lang

Ligne 252 : Changement grammatical
- de "Paiements issue de l'acompte"
- en "Paiement issu de l'acompte"
Merge pull request #1821 from astebert/patch-1

Update bills.lang
Avoid missing class error for fetch_thirdparty method
Not need to test if class exists with require_once
 Avoid missing class error for fetch_thirdparty method
Merge pull request #1973 from jfefe/patch-6

 Avoid missing class error for fetch_thirdparty method
Update changelog
Fix : actioncomme report was not filtering by entity...
Merge pull request #1995 from atm-maxime/3.4

Fix : actioncomme report was not filtering by entity...
Merge remote-tracking branch 'origin/3.4' into 3.5
FIX: copy extrafields when creating order from propale and creating
invoice from order
Merge pull request #1941 from jfefe/patch-3

Avoid missing class error for fetch_thirdparty method
check extrafields before inserting in DB
FIX: bad margin and buy_price calculation when total_ht = 0 (discount
100%) on a line
Merge pull request #2016 from altatof/3.5

FIX: copy extrafields when creating order from propale and creating
Fix bug 1692 Can't update phone_pro with the contact webservice
Merge pull request #2066 from altatof/fix_margin_recap

FIX: bad margin and buy_price calculation when total_ht = 0 (discount 100%) on a line
Merge pull request #2067 from frederic34/patch-2

Fix bug 1692 Can't update phone_pro with the contact webservice
Prepare 3.5.6
Merge remote-tracking branch 'origin/3.5' into 3.5_backported

Conflicts:
	ChangeLog