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/alixrousqt/www/erp/dev/translation/../../htdocs/langs/en_US/ - 101 found

#StringFile and lines
1ShowAccountingJournalaccountancy.lang (99 - Show accounting journal) (314 - Show accounting journal)
33NewAssetTypeassets.lang (24 - New asset type) (65 - New asset type)
53ErrorRefAlreadyExistserrors.lang (11 - Reference <b>%s</b> already exists.) (83 - Ref used for creation already exists.)
59NotTheAssignedApproverholiday.lang (77 - You are not the assigned approver) (101 - You are not the assigned approver)
64Language_es_GTlanguages.lang (40 - Spanish (Guatemala)) (49 - Spanish (USA))
73ReasonDeclineOrCancelpartnership.lang (55 - Decline reason) (82 - Reason for declining or canceling)
94unitGproducts.lang (206 - Gram) (214 - Gram)
95unitMproducts.lang (207 - Meter) (218 - Meter)
96unitM2products.lang (209 - Square meter) (224 - Square meter)
97unitM3products.lang (210 - Cubic meter) (230 - Cubic meter)
98Receptionreceptions.lang (4 - Reception) (7 - Reception)
99Receptionsreceptions.lang (5 - Receptions) (8 - Receptions)
101ImportSitewebsite.lang (76 - Import website template) (120 - Import website)
3ByYearaccountancy.lang (220 - By year)
main.lang (819 - By year)
30Eventsagenda.lang (12 - Events)
main.lang (932 - Events)
42ShowDetailsblockedlog.lang (16 - Show stored details)
main.lang (1098 - Show details)
46Browsercashdesk.lang (93 - Browser)
main.lang (738 - Browser)
51StatusToPaycompta.lang (66 - To pay)
main.lang (440 - To pay)
60IncotermLabelincoterm.lang (3 - Incoterms)
main.lang (946 - Incoterms)
62StatusInterInvoicedinterventions.lang (30 - Billed)
main.lang (530 - Invoiced)
66ConfirmCloneAskmain.lang (182 - Are you sure you want to clone the object <b>%s</b>?)
supplier_proposal.lang (38 - Are you sure you want to clone the price request <b>%s</b>?)
67ReOpenmain.lang (200 - Re-Open)
stocks.lang (253 - Reopen)
68Typemain.lang (230 - Type)
ticket.lang (73 - Type)
69MulticurrencyPaymentAmountmain.lang (380 - Payment amount, original currency)
multicurrency.lang (19 - Payment amount, original currency)
70Rejectsmain.lang (549 - Rejects)
withdrawals.lang (40 - Rejects)
6InternalUseradmin.lang (52 - Internal user)
users.lang (71 - Internal user)
7NewModuleadmin.lang (218 - New module)
modulebuilder.lang (8 - New module)
8NoticePeriodadmin.lang (280 - Notice period)
holiday.lang (113 - Notice period)
9LanguageFileadmin.lang (381 - Language file)
modulebuilder.lang (51 - File for language)
10PriceFormatInCurrentLanguageadmin.lang (423 - Price Format In Current Language)
companies.lang (30 - Price display format in the current language and currency)
11Stringadmin.lang (424 - String)
members.lang (112 - String)
12Intadmin.lang (429 - Integer)
members.lang (114 - Int)
13DateAndTimeadmin.lang (431 - Date and hour)
members.lang (115 - Date and time)
14Fieldadmin.lang (513 - Field)
blockedlog.lang (2 - Field)
exports.lang (63 - Field)
15Module62000Nameadmin.lang (687 - Incoterms)
incoterm.lang (1 - Incoterm)
16Module62000Descadmin.lang (688 - Add features to manage Incoterms)
incoterm.lang (2 - Add features to manage Incoterm)
17Upgradeadmin.lang (1114 - Upgrade)
install.lang (104 - Upgrade)
18Serveradmin.lang (1125 - Server)
install.lang (49 - Server)
19DatabaseServeradmin.lang (1127 - Database host)
install.lang (52 - Database server)
20DatabaseNameadmin.lang (1128 - Database name)
install.lang (53 - Database name)
21DriverTypeadmin.lang (1136 - Driver type)
install.lang (48 - Driver type)
22CompanyNameadmin.lang (1157 - Name)
companies.lang (25 - Company name)
23WithdrawalsSetupadmin.lang (1677 - Setup of module Direct Debit payments)
withdrawals.lang (36 - Direct debit payment setup)
24Buyadmin.lang (1761 - Buy)
products.lang (56 - Purchase)
25Selladmin.lang (1762 - Sell)
products.lang (55 - Sell)
26AccountancyCodeadmin.lang (1765 - Accounting Code)
companies.lang (325 - Accounting account)
27CashDeskadmin.lang (1791 - Point of Sale)
cashdesk.lang (3 - Point of sale)
28ByDefaultInListadmin.lang (1950 - Show by default on list view)
categories.lang (94 - By default in list)
2LineIdaccountancy.lang (139 - Id line)
exports.lang (43 - Id of line)
4CustomerInvoicePaymentaccountancy.lang (237 - Payment of invoice customer)
banks.lang (104 - Customer payment)
5NotReconciledaccountancy.lang (303 - Not reconciled)
banks.lang (103 - Not reconciled)
29AffectedToagenda.lang (10 - Assigned to)
projects.lang (119 - Allocated to)
31Locationagenda.lang (16 - Location)
stocks.lang (39 - Location)
32InterventionSentByEMailagenda.lang (85 - Intervention %s sent by email)
interventions.lang (38 - Intervention %s sent by email)
34DeleteTypeassets.lang (29 - Delete)
members.lang (84 - Delete)
35ShowTypeCardassets.lang (32 - Show type '%s')
members.lang (157 - Show type '%s')
36Settings assets.lang (43 - Settings)
knowledgemanagement.lang (29 - Settings)
recruitment.lang (29 - Settings)
37IBANbanks.lang (32 - IBAN number)
bills.lang (451 - IBAN)
38BICbanks.lang (33 - BIC/SWIFT code)
bills.lang (454 - BIC/SWIFT)
39Accountbanks.lang (67 - Account)
compta.lang (15 - Account)
40SubscriptionPaymentbanks.lang (106 - Subscription payment)
members.lang (171 - Contribution payment)
41InvoiceRefbills.lang (332 - Invoice ref.)
receiptprinter.lang (67 - Invoice ref)
43NoSupplierOrderboxes.lang (80 - No recorded purchase order)
orders.lang (84 - No purchase order)
44ShowCompanycashdesk.lang (30 - Show company)
companies.lang (341 - Third Party)
45Historycashdesk.lang (71 - History)
suppliers.lang (7 - History)
47DeleteFromCatcategories.lang (85 - Remove from tags/category)
compta.lang (267 - Remove from accounting group)
48Customercommercial.lang (4 - Customer)
companies.lang (285 - Customer)
49Prospectcommercial.lang (6 - Prospect)
companies.lang (283 - Prospect)
propal.lang (12 - Prospect)
50ShowTaskcommercial.lang (18 - Show task)
projects.lang (39 - Show task)
52ContractStatusClosedcontracts.lang (9 - Closed)
products.lang (84 - Closed)
54NewSubscriptioneventorganization.lang (132 - Registration)
members.lang (71 - New subscription)
55ExportsAreaexports.lang (2 - Exports)
other.lang (270 - Exports area)
56ExportableDatasexports.lang (6 - Exportable dataset)
other.lang (274 - Exportable data)
57AvailableFormatsexports.lang (27 - Available Formats)
other.lang (271 - Available formats)
58ChooseFileToImportexports.lang (59 - Upload file then click on the %s icon to select file as source import file...)
stocks.lang (249 - Upload file then click on the %s icon to select file as source import file...)
61CreateUserinstall.lang (60 - Create user account or grant user account permission on the Dolibarr database)
users.lang (31 - Create user)
63About knowledgemanagement.lang (36 - About)
recruitment.lang (38 - About)
65Answeredmails.lang (175 - Answered)
ticket.lang (67 - Answered)
71OrderDateorders.lang (10 - Order date)
suppliers.lang (10 - Order date)
72CreatedByother.lang (114 - Created by %s)
ticket.lang (161 - Created by)
74FollowingUrlAreAvailableToMakePaymentspaybox.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)
75PaymentFormpaybox.lang (5 - Payment form)
stripe.lang (6 - Payment form)
76WelcomeOnPaymentPagepaybox.lang (6 - Welcome to our online payment service)
stripe.lang (7 - Welcome to our online payment service)
77ThisScreenAllowsYouToPaypaybox.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.)
78ThisIsInformationOnPaymentpaybox.lang (8 - This is information on payment to do)
stripe.lang (9 - This is information on payment to do)
79ToCompletepaybox.lang (9 - To complete)
stripe.lang (10 - To complete)
80YourEMailpaybox.lang (10 - Email to receive payment confirmation)
stripe.lang (11 - Email to receive payment confirmation)
81Creditorpaybox.lang (11 - Creditor)
stripe.lang (13 - Creditor)
82PaymentCodepaybox.lang (12 - Payment code)
stripe.lang (14 - Payment code)
83Continuepaybox.lang (15 - Next)
stripe.lang (17 - Next)
84AccountParameterpaybox.lang (19 - Account parameters)
stripe.lang (27 - Account parameters)
85UsageParameterpaybox.lang (20 - Usage parameters)
stripe.lang (28 - Usage parameters)
86InformationToFindParameterspaybox.lang (21 - Help to find your %s account information)
stripe.lang (29 - Help to find your %s account information)
87CSSUrlForPaymentFormpaybox.lang (23 - CSS style sheet url for payment form)
stripe.lang (31 - CSS style sheet url for payment form)
88Stockproducts.lang (51 - Stock)
stocks.lang (18 - Stock)
89Stocksproducts.lang (53 - Stocks and location (warehouse) of products)
stocks.lang (19 - Stocks)
90Movementsproducts.lang (54 - Movements)
stocks.lang (27 - Movements)
91Suppliersproducts.lang (89 - Vendors)
suppliers.lang (2 - Vendors)
92ListOfStockMovementsproducts.lang (96 - List of stock movements)
stocks.lang (30 - List of stock movements)
93Unitproducts.lang (180 - Unit)
stocks.lang (46 - Unit)
100NewUserticket.lang (288 - New user)
users.lang (30 - New user)