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/cottineace/www/gestion/dev/translation/../../htdocs/langs/en_US/ - 113 found

#StringFile and lines
1ShowAccountingJournalaccountancy.lang (91 - Show accounting journal) (281 - Show accounting journal)
51NewAssetTypeassets.lang (24 - New asset type) (64 - New asset type)
73NotTheAssignedApproverholiday.lang (76 - You are not the assigned approver) (100 - You are not the assigned approver)
106unitGproducts.lang (196 - Gram) (204 - Gram)
107unitMproducts.lang (197 - Meter) (208 - Meter)
108unitM2products.lang (199 - Square meter) (214 - Square meter)
109unitM3products.lang (200 - Cubic meter) (220 - Cubic meter)
110Receptionreceptions.lang (4 - Reception) (7 - Reception)
111Receptionsreceptions.lang (5 - Receptions) (8 - Receptions)
113ImportSitewebsite.lang (72 - Import website template) (116 - Import website)
3ByYearaccountancy.lang (197 - By year)
main.lang (787 - By year)
29Eventsagenda.lang (12 - Events)
main.lang (892 - Events)
60ShowDetailsblockedlog.lang (16 - Show stored details)
main.lang (1018 - Show details)
68StatusToPaycompta.lang (66 - To pay)
main.lang (421 - To pay)
74IncotermLabelincoterm.lang (3 - Incoterms)
main.lang (906 - Incoterms)
76StatusInterInvoicedinterventions.lang (30 - Billed)
main.lang (505 - Invoiced)
77Closedmain.lang (144 - Closed)
ticket.lang (69 - Closed)
78Typemain.lang (220 - Type)
ticket.lang (73 - Type)
79MulticurrencyPaymentAmountmain.lang (365 - Payment amount, original currency)
multicurrency.lang (19 - Payment amount, original currency)
80Categorymain.lang (481 - Tag/category)
ticket.lang (74 - Analytic code)
81OpenAllmain.lang (508 - Open (All))
stocks.lang (153 - Open for all actions)
82NotReadmain.lang (659 - Not read)
ticket.lang (62 - Not read)
5InternalUseradmin.lang (48 - Internal user)
users.lang (68 - Internal user)
6NewModuleadmin.lang (209 - New)
modulebuilder.lang (8 - New module)
7NoticePeriodadmin.lang (267 - Notice period)
holiday.lang (112 - Notice period)
8LanguageFileadmin.lang (365 - Language file)
modulebuilder.lang (50 - File for language)
9PriceFormatInCurrentLanguageadmin.lang (406 - Price Format In Current Language)
companies.lang (31 - Price display format in the current language and currency)
10Stringadmin.lang (407 - String)
members.lang (105 - String)
11Intadmin.lang (410 - Integer)
members.lang (107 - Int)
12DateAndTimeadmin.lang (412 - Date and hour)
members.lang (108 - Date and time)
13Fieldadmin.lang (488 - Field)
blockedlog.lang (2 - Field)
exports.lang (60 - Field)
14Module62000Nameadmin.lang (660 - Incoterms)
incoterm.lang (1 - Incoterm)
15Module62000Descadmin.lang (661 - Add features to manage Incoterms)
incoterm.lang (2 - Add features to manage Incoterm)
16Upgradeadmin.lang (1030 - Upgrade)
install.lang (106 - Upgrade)
17Serveradmin.lang (1041 - Server)
install.lang (51 - Server)
18DatabaseServeradmin.lang (1043 - Database host)
install.lang (54 - Database server)
19DatabaseNameadmin.lang (1044 - Database name)
install.lang (55 - Database name)
20DriverTypeadmin.lang (1052 - Driver type)
install.lang (50 - Driver type)
21CompanyNameadmin.lang (1073 - Name)
companies.lang (26 - Company name)
22WithdrawalsSetupadmin.lang (1568 - Setup of module Direct Debit payments)
withdrawals.lang (22 - Direct debit payment setup)
23Buyadmin.lang (1650 - Buy)
products.lang (54 - Purchase)
24Selladmin.lang (1651 - Sell)
products.lang (53 - Sell)
25AccountancyCodeadmin.lang (1654 - Accounting Code)
companies.lang (306 - Accounting account)
26CashDeskadmin.lang (1677 - Point of Sale)
cashdesk.lang (3 - Point of sale)
27ByDefaultInListadmin.lang (1828 - Show by default on list view)
categories.lang (90 - By default in list)
2LineIdaccountancy.lang (127 - Id line)
exports.lang (41 - Id of line)
4CustomerInvoicePaymentaccountancy.lang (214 - Payment of invoice customer)
banks.lang (101 - Customer payment)
28AffectedToagenda.lang (10 - Assigned to)
projects.lang (117 - Allocated to)
30Locationagenda.lang (16 - Location)
stocks.lang (34 - Location)
31InterventionSentByEMailagenda.lang (83 - Intervention %s sent by email)
interventions.lang (38 - Intervention %s sent by email)
32CommRequestaskpricesupplier.lang (7 - Price request)
supplier_proposal.lang (5 - Price request)
33CommRequestsaskpricesupplier.lang (8 - Price requests)
supplier_proposal.lang (6 - Price requests)
34SearchRequestaskpricesupplier.lang (9 - Find a request)
supplier_proposal.lang (7 - Find a request)
35DraftRequestsaskpricesupplier.lang (10 - Draft requests)
supplier_proposal.lang (8 - Draft requests)
36LastModifiedRequestsaskpricesupplier.lang (11 - Last %s modified price requests)
supplier_proposal.lang (10 - Latest %s modified price requests)
37RequestsOpenedaskpricesupplier.lang (12 - Open price requests)
supplier_proposal.lang (11 - Open price requests)
38NewAskPriceaskpricesupplier.lang (15 - New price request)
supplier_proposal.lang (16 - New price request)
39ConfirmValidateAskaskpricesupplier.lang (23 - Are you sure you want to validate this price request under name <b>%s</b> ?)
supplier_proposal.lang (22 - Are you sure you want to validate this price request under name <b>%s</b>?)
40DeleteAskaskpricesupplier.lang (25 - Delete request)
supplier_proposal.lang (23 - Delete request)
41ValidateAskaskpricesupplier.lang (26 - Validate request)
supplier_proposal.lang (24 - Validate request)
42CopyAskFromaskpricesupplier.lang (44 - Create price request by copying existing a request)
supplier_proposal.lang (35 - Create a price request by copying an existing request)
43CreateEmptyAskaskpricesupplier.lang (45 - Create blank request)
supplier_proposal.lang (36 - Create blank request)
44ConfirmCloneAskaskpricesupplier.lang (47 - Are you sure you want to clone the price request <b>%s</b> ?)
supplier_proposal.lang (37 - Are you sure you want to clone the price request <b>%s</b>?)
45ConfirmReOpenAskaskpricesupplier.lang (48 - Are you sure you want to open back the price request <b>%s</b> ?)
supplier_proposal.lang (38 - Are you sure you want to open back the price request <b>%s</b>?)
46SendAskByMailaskpricesupplier.lang (49 - Send price request by mail)
supplier_proposal.lang (39 - Send price request by mail)
47SendAskRefaskpricesupplier.lang (50 - Sending the price request %s)
supplier_proposal.lang (40 - Sending the price request %s)
48ConfirmDeleteAskaskpricesupplier.lang (52 - Are you sure you want to delete this price request ?)
supplier_proposal.lang (42 - Are you sure you want to delete this price request <b>%s</b>?)
49DocModelAuroreDescriptionaskpricesupplier.lang (54 - A complete request model (logo...))
supplier_proposal.lang (44 - A complete request model (logo...))
50CommercialAskaskpricesupplier.lang (55 - Price request)
supplier_proposal.lang (45 - Price request)
52DeleteTypeassets.lang (29 - Delete)
members.lang (80 - Delete)
53ShowTypeCardassets.lang (32 - Show type '%s')
members.lang (148 - Show type '%s')
54IBANbanks.lang (32 - IBAN number)
bills.lang (448 - IBAN)
55BICbanks.lang (33 - BIC/SWIFT code)
bills.lang (449 - BIC/SWIFT)
56StandingOrdersbanks.lang (38 - Direct Debit orders)
bills.lang (249 - Direct debit orders)
57StandingOrderbanks.lang (39 - Direct debit order)
bills.lang (250 - Direct debit order)
58Accountbanks.lang (64 - Account)
compta.lang (15 - Account)
59SubscriptionPaymentbanks.lang (103 - Subscription payment)
members.lang (162 - Subscription payment)
61NoSupplierOrderboxes.lang (72 - No recorded purchase order)
orders.lang (80 - No purchase order)
62ShowCompanycashdesk.lang (29 - Show company)
companies.lang (322 - Show Third Party)
63Historycashdesk.lang (66 - History)
suppliers.lang (6 - History)
64DeleteFromCatcategories.lang (83 - Remove from tags/category)
compta.lang (247 - Remove from accounting group)
65Customercommercial.lang (4 - Customer)
companies.lang (267 - Customer)
66Prospectcommercial.lang (6 - Prospect)
companies.lang (265 - Prospect)
propal.lang (12 - Prospect)
67ShowTaskcommercial.lang (18 - Show task)
projects.lang (39 - Show task)
69ContractStatusClosedcontracts.lang (9 - Closed)
products.lang (82 - Closed)
70ExportsAreaexports.lang (2 - Exports)
other.lang (259 - Exports area)
71ExportableDatasexports.lang (6 - Exportable dataset)
other.lang (263 - Exportable data)
72AvailableFormatsexports.lang (27 - Available Formats)
other.lang (260 - Available formats)
75CreateUserinstall.lang (62 - Create user account or grant user account permission on the Dolibarr database)
users.lang (30 - Create user)
83OrderDateorders.lang (10 - Order date)
suppliers.lang (9 - Order date)
84CreatedByother.lang (110 - Created by %s)
ticket.lang (156 - Created by)
85FollowingUrlAreAvailableToMakePaymentspaybox.lang (4 - Following URLs are available to offer a page to a customer to make a payment on Dolibarr objects)
stripe.lang (5 - Following URLs are available to offer a page to a customer to make a payment on Dolibarr objects)
86PaymentFormpaybox.lang (5 - Payment form)
stripe.lang (6 - Payment form)
87WelcomeOnPaymentPagepaybox.lang (6 - Welcome to our online payment service)
stripe.lang (7 - Welcome to our online payment service)
88ThisScreenAllowsYouToPaypaybox.lang (7 - This screen allow you to make an online payment to %s.)
stripe.lang (8 - This screen allow you to make an online payment to %s.)
89ThisIsInformationOnPaymentpaybox.lang (8 - This is information on payment to do)
stripe.lang (9 - This is information on payment to do)
90ToCompletepaybox.lang (9 - To complete)
stripe.lang (10 - To complete)
91YourEMailpaybox.lang (10 - Email to receive payment confirmation)
stripe.lang (11 - Email to receive payment confirmation)
92Creditorpaybox.lang (11 - Creditor)
stripe.lang (13 - Creditor)
93PaymentCodepaybox.lang (12 - Payment code)
stripe.lang (14 - Payment code)
94Continuepaybox.lang (15 - Next)
stripe.lang (17 - Next)
95AccountParameterpaybox.lang (19 - Account parameters)
stripe.lang (27 - Account parameters)
96UsageParameterpaybox.lang (20 - Usage parameters)
stripe.lang (28 - Usage parameters)
97InformationToFindParameterspaybox.lang (21 - Help to find your %s account information)
stripe.lang (29 - Help to find your %s account information)
98VendorNamepaybox.lang (23 - Name of vendor)
stripe.lang (31 - Name of vendor)
99CSSUrlForPaymentFormpaybox.lang (24 - CSS style sheet url for payment form)
stripe.lang (32 - CSS style sheet url for payment form)
100Stockproducts.lang (49 - Stock)
stocks.lang (18 - Stock)
101Stocksproducts.lang (51 - Stocks and location (warehouse) of products)
stocks.lang (19 - Stocks)
102Movementsproducts.lang (52 - Movements)
stocks.lang (23 - Movements)
103Suppliersproducts.lang (87 - Vendors)
suppliers.lang (2 - Vendors)
104ListOfStockMovementsproducts.lang (94 - List of stock movements)
stocks.lang (26 - List of stock movements)
105Unitproducts.lang (170 - Unit)
stocks.lang (41 - Unit)
112NewUserticket.lang (281 - New user)
users.lang (29 - New user)