If you call this with argument "unused=true" it searches for the translation strings that exist in en_US but are never used.
IMPORTANT: that can take quite a lot of time (up to 10 minutes), you need to tune the max_execution_time on your php.ini accordingly.

Duplicate strings in lang files in /home/vubi/public_html/gestion/dev/translation/../../htdocs/langs/en_US/ - 73 found

#StringFile and lines
9InternalUseradmin.lang (34 - Internal user)
users.lang (65 - Internal user)
10Stringadmin.lang (339 - String)
members.lang (97 - String)
11Intadmin.lang (341 - Integer)
members.lang (99 - Int)
12DateAndTimeadmin.lang (343 - Date and hour)
members.lang (100 - Date and time)
13Module60000Descadmin.lang (540 - Module to manage commissions)
commissions.lang (4 - Commissions management)
14Upgradeadmin.lang (863 - Upgrade)
install.lang (98 - Upgrade)
15Serveradmin.lang (875 - Server)
install.lang (44 - Server)
16DatabaseServeradmin.lang (877 - Database host)
install.lang (47 - Database server)
17DatabaseNameadmin.lang (878 - Database name)
install.lang (48 - Database name)
18DriverTypeadmin.lang (886 - Driver type)
install.lang (43 - Driver type)
19CompanyNameadmin.lang (905 - Name)
companies.lang (24 - Company name)
20Miscellaneousadmin.lang (1087 - Miscellaneous)
other.lang (58 - Miscellaneous)
21CreditNoteadmin.lang (1094 - Credit note)
bills.lang (265 - Credit note)
22CreditNotesadmin.lang (1095 - Credit notes)
bills.lang (266 - Credit notes)
23WithdrawalsSetupadmin.lang (1340 - Withdrawal module setup)
withdrawals.lang (21 - Withdrawal setup)
24Buyadmin.lang (1424 - Buy)
products.lang (41 - Purchases)
25Selladmin.lang (1425 - Sell)
products.lang (40 - Sales)
26AccountancyCodeadmin.lang (1428 - Accountancy Code)
companies.lang (273 - Accountancy code)
27CashDeskadmin.lang (1445 - Point of sales)
cashdesk.lang (3 - Point of sale)
28ByDefaultInListadmin.lang (1575 - Show by default on list view)
categories.lang (82 - By default in list)
1NewAccountaccountancy.lang (28 - New accounting account)
banks.lang (48 - New account)
compta.lang (92 - New account)
2Createaccountancy.lang (29 - Create)
products.lang (13 - Create)
3DescSellsJournalaccountancy.lang (97 - Sales journal)
compta.lang (164 - Sales Journal)
4DescPurchasesJournalaccountancy.lang (98 - Purchases journal)
compta.lang (165 - Purchases Journal)
5CustomerInvoicePaymentaccountancy.lang (102 - Payment of invoice customer)
banks.lang (91 - Customer payment)
6Accountparentaccountancy.lang (118 - Root of the account)
compta.lang (16 - Account parent)
7Exportsaccountancy.lang (144 - Exports)
members.lang (155 - Exports)
8Exportaccountancy.lang (145 - Export)
other.lang (223 - Export)
29Calendaragenda.lang (6 - Calendar)
other.lang (3 - Calendar)
30AffectedToagenda.lang (10 - Assigned to)
projects.lang (91 - Allocated to)
31Locationagenda.lang (15 - Location)
stocks.lang (23 - Location)
32PropalValidatedInDolibarragenda.lang (37 - Proposal %s validated)
other.lang (209 - Proposal %s validated)
33InvoiceValidatedInDolibarragenda.lang (38 - Invoice %s validated)
other.lang (211 - Invoice %s validated)
34InterventionSentByEMailagenda.lang (56 - Intervention %s sent by EMail)
interventions.lang (39 - Intervention %s sent by EMail)
35NewCompanyToDolibarragenda.lang (60 - Third party created)
other.lang (205 - Company %s added)
36IBANbanks.lang (29 - IBAN number)
bills.lang (376 - IBAN)
37BICbanks.lang (32 - BIC/SWIFT number)
bills.lang (377 - BIC/SWIFT)
38StandingOrdersbanks.lang (35 - Standing orders)
bills.lang (212 - Standing orders)
withdrawals.lang (3 - Standing orders)
39StandingOrderbanks.lang (36 - Standing order)
bills.lang (213 - Standing order)
withdrawals.lang (4 - Standing orders)
40Accountbanks.lang (61 - Account)
compta.lang (15 - Account)
41SubscriptionPaymentbanks.lang (93 - Subscription payment)
members.lang (138 - Subscription payment)
42Paymentsbills.lang (60 - Payments)
compta.lang (60 - Payments)
43InvoiceRefbills.lang (288 - Invoice ref.)
compta.lang (166 - Invoice ref.)
44NoSupplierOrderboxes.lang (66 - No recorded supplier order)
orders.lang (75 - No supplier order)
45ShowCompanycashdesk.lang (30 - Show company)
companies.lang (289 - Show thirdparty)
46Customercommercial.lang (4 - Customer)
companies.lang (246 - Customer)
47Prospectcommercial.lang (6 - Prospect)
companies.lang (244 - Prospect)
propal.lang (12 - Prospect)
48CHARSETcommissions.lang (2 - UTF-8)
domains.lang (2 - UTF-8)
49AgentContactTypecommissions.lang (43 - Contact type used for commissioning)
margins.lang (38 - Commercial agent contact type)
50AgentContactTypeDetailscommissions.lang (44 - Défine what contact type (linked on invoices) will be associated with commercial agents)
margins.lang (39 - Define what contact type (linked on invoices) will be used for margin report per sale representative)
51ContractStatusClosedcontracts.lang (9 - Closed)
products.lang (67 - Closed)
52ExportsAreaexports.lang (2 - Exports area)
other.lang (224 - Exports area)
53NewExportexports.lang (4 - New export)
other.lang (230 - New export)
54ExportableDatasexports.lang (6 - Exportable dataset)
other.lang (228 - Exportable data)
55AvailableFormatsexports.lang (27 - Available formats)
other.lang (225 - Available formats)
56LibraryUsedexports.lang (29 - Library used)
other.lang (226 - Librairy used)
57LibraryVersionexports.lang (30 - Version)
other.lang (227 - Version)
58CreateUserinstall.lang (54 - Create owner)
users.lang (29 - Create user)
59Naturemembers.lang (153 - Nature)
products.lang (151 - Nature)
60OrderDateorders.lang (9 - Order date)
suppliers.lang (9 - Order date)
61LastOrdersorders.lang (76 - Latest %s customer orders)
shop.lang (4 - Last orders)
62OSCommerceoscommerce.lang (2 - OS Commerce)
shop.lang (9 - OSCommerce)
63PrintIPPDescprinting.lang (33 - This driver allow to send documents directly to a printer. It requires a Linux system with CUPS installed.)
printipp.lang (3 - This module adds a Print button to send documents directly to a printer. It requires a Linux system with CUPS installed.)
64PRINTIPP_HOSTprinting.lang (34 - Print server)
printipp.lang (5 - Print server)
65PRINTIPP_PORTprinting.lang (35 - Port)
printipp.lang (6 - Port)
66PRINTIPP_USERprinting.lang (36 - Login)
printipp.lang (7 - Login)
67PRINTIPP_PASSWORDprinting.lang (37 - Password)
printipp.lang (8 - Password)
68Stockproducts.lang (37 - Stock)
stocks.lang (15 - Stock)
69Stocksproducts.lang (38 - Stocks)
stocks.lang (16 - Stocks)
70Movementsproducts.lang (39 - Movements)
stocks.lang (18 - Movements)
71Suppliersproducts.lang (72 - Suppliers)
suppliers.lang (2 - Suppliers)
72ListOfStockMovementsproducts.lang (79 - List of stock movements)
stocks.lang (21 - List of stock movements)
73Unitproducts.lang (153 - Unit)
stocks.lang (30 - Unit)