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/gsanimat/crm/dev/translation/../../htdocs/langs/en_US/ - 71 found

#StringFile and lines
30InvoiceSubtypebills.lang (679 - Invoice Subtype)
main.lang (1308 - Invoice subtype)
38AccountancyCodecompanies.lang (306 - Accounting account)
main.lang (898 - Accounting Code)
52LinkANewFilelink.lang (2 - Link a new file/document)
main.lang (1297 - Link a new file/document)
53LinkedFileslink.lang (3 - Linked files and documents)
main.lang (1298 - Linked files and documents)
54NoLinkFoundlink.lang (4 - No registered links)
main.lang (1299 - No registered links)
55LinkCompletelink.lang (5 - The file has been linked successfully)
main.lang (1300 - The file has been linked successfully)
56ErrorFileNotLinkedlink.lang (6 - The file could not be linked)
main.lang (1301 - The file could not be linked)
57LinkRemovedlink.lang (7 - The link %s has been removed)
main.lang (1302 - The link %s has been removed)
58ErrorFailedToDeleteLinklink.lang (8 - Failed to remove link '<b>%s</b>')
main.lang (1303 - Failed to remove link '<b>%s</b>')
59ErrorFailedToUpdateLinklink.lang (9 - Failed to update link '<b>%s</b>')
main.lang (1304 - Failed to update link '<b>%s</b>')
60URLToLinklink.lang (10 - URL to link)
main.lang (1305 - URL to link)
61OverwriteIfExistslink.lang (11 - Overwrite file if exists)
main.lang (1306 - Overwrite if file exists)
3IdModuleadmin.lang (141 - Module ID)
modulebuilder.lang (2 - Module id)
4NoticePeriodadmin.lang (294 - Notice period)
holiday.lang (127 - Notice period)
5LanguageFileadmin.lang (403 - Language file)
modulebuilder.lang (57 - File for language)
6PriceFormatInCurrentLanguageadmin.lang (448 - Price Format In Current Language)
companies.lang (33 - Price display format in the current language and currency)
7Upgradeadmin.lang (1210 - Upgrade)
install.lang (100 - Upgrade)
8Serveradmin.lang (1221 - Server)
install.lang (45 - Server)
9DatabaseServeradmin.lang (1223 - Database host)
install.lang (48 - Database server)
10DatabaseNameadmin.lang (1224 - Database name)
install.lang (49 - Database name)
11Buyadmin.lang (1899 - Buy)
products.lang (56 - Purchase)
12Selladmin.lang (1900 - Sell)
products.lang (55 - Sell)
13CashDeskadmin.lang (1936 - Point of Sale)
cashdesk.lang (3 - Point of sale)
14ByDefaultInListadmin.lang (2115 - Show by default on list view)
categories.lang (98 - By default in list)
15ZapierForDolibarrSetupadmin.lang (2578 - Setup of Zapier for Dolibarr)
zapier.lang (18 - Setup of Zapier for Dolibarr)
16ZapierDescriptionadmin.lang (2579 - Interface with Zapier)
zapier.lang (19 - Interface with Zapier)
17ZapierAboutadmin.lang (2580 - About the module Zapier)
zapier.lang (20 - About the module Zapier)
18ZapierSetupPageadmin.lang (2581 - There is no need for a setup on Dolibarr side to use Zapier. However, you must generate and publish a package on zapier to be able to use Zapier with Dolibarr. See documentation on <a href)
zapier.lang (21 - There is no need for a setup on Dolibarr side to use Zapier. However, you must generate and publish a package on zapier to be able to use Zapier with Dolibarr. See documentation on <a href)
1LineIdaccountancy.lang (146 - Id line)
exports.lang (45 - Id of line)
2CustomerInvoicePaymentaccountancy.lang (253 - Payment of invoice customer)
banks.lang (109 - Customer payment)
19AffectedToagenda.lang (11 - Assigned to)
projects.lang (124 - Allocated to)
20Locationagenda.lang (15 - Location)
stocks.lang (38 - Location)
21ReceptionClassifyClosedInDolibarragenda.lang (71 - Reception %s classified closed)
receptions.lang (50 - Reception %s classified Closed)
22InterventionSentByEMailagenda.lang (89 - Intervention %s sent by email)
interventions.lang (48 - Intervention %s sent by email)
23DeleteTypeassets.lang (21 - Delete)
members.lang (99 - Delete)
24ShowTypeCardassets.lang (24 - Show model '%s')
members.lang (169 - Show type '%s')
25IBANbanks.lang (33 - IBAN number)
bills.lang (505 - IBAN)
26BICbanks.lang (34 - BIC/SWIFT code)
bills.lang (510 - BIC/SWIFT)
27SubscriptionPaymentbanks.lang (111 - Subscription payment)
members.lang (183 - Contribution payment)
28InvoiceRefbills.lang (367 - Invoice ref.)
receiptprinter.lang (72 - Invoice ref)
29Salariesbills.lang (678 - Salaries)
salaries.lang (7 - Salaries)
31NoSupplierOrderboxes.lang (83 - No purchase order recorded)
orders.lang (87 - No purchase order)
32ShowCompanycashdesk.lang (32 - Show company)
companies.lang (322 - Third Party)
33Historycashdesk.lang (74 - History)
suppliers.lang (8 - History)
34DeleteFromCatcategories.lang (83 - Remove from tags/category)
compta.lang (294 - Remove from accounting group)
35Customercommercial.lang (4 - Customer)
companies.lang (260 - Customer)
36Prospectcommercial.lang (6 - Prospect)
companies.lang (258 - Prospect)
propal.lang (12 - Prospect)
37ShowTaskcommercial.lang (19 - Show task)
projects.lang (41 - Show task)
39ContractStatusClosedcontracts.lang (9 - Closed)
products.lang (90 - Closed)
40MinimumAmountdonations.lang (27 - Minimum amount is %s)
members.lang (215 - Minimum amount of membership payment (has priority on any default amounts))
41ErrorRecordNotFounderrors.lang (16 - Record not found.)
expensereports.lang (7 - Record not found)
42ErrorBadValueForParametererrors.lang (49 - Wrong value '%s' for parameter '%s')
expensereports.lang (9 - Error bad value for parameter %s)
43NewSubscriptioneventorganization.lang (121 - Registration)
members.lang (79 - New contribution)
44ExpenseReportPaymentsexpensereports.lang (1 - Expense report payments)
trips.lang (121 - Expense report payments)
45TaxUndefinedForThisCategory expensereports.lang (6 - Taxe undefined for this category)
trips.lang (122 - Tax is undefined for this category)
46errorComputeTtcOnMileageExpenseexpensereports.lang (8 - Error on computing mileage expense)
trips.lang (123 - Error on computing mileage expense)
47ExportsAreaexports.lang (3 - Exports)
other.lang (297 - Exports area)
48ExportableDatasexports.lang (7 - Exportable dataset)
other.lang (301 - Exportable data)
49AvailableFormatsexports.lang (29 - Available Formats)
other.lang (298 - Available formats)
50ChooseFileToImportexports.lang (68 - Upload file then click on the %s icon to select file as source import file...)
stocks.lang (254 - Upload file then click on the %s icon to select file as source import file...)
51CreateUserinstall.lang (55 - Create user account or grant user account permission on the Dolibarr database)
users.lang (31 - Create user)
62CreatedByother.lang (130 - Created by %s)
ticket.lang (169 - Created by)
63Stockproducts.lang (51 - Stock)
stocks.lang (18 - Stock)
64Stocksproducts.lang (53 - Stocks and location (warehouse) of products)
stocks.lang (19 - Stocks)
65Movementsproducts.lang (54 - Movements)
stocks.lang (29 - Movements)
66Suppliersproducts.lang (95 - Vendors)
suppliers.lang (2 - Vendors)
67Unitproducts.lang (185 - Unit)
stocks.lang (45 - Unit)
68ContractSignedpropal.lang (98 - Contract signed)
recruitment.lang (48 - Contract signed)
69WithdrawalReceiptsalaries.lang (32 - Credit transfer order)
withdrawals.lang (12 - Direct debit order)
70OrderWaitingsalaries.lang (33 - Pending order)
withdrawals.lang (94 - Waiting for treatment)
71NewUserticket.lang (305 - New user)
users.lang (30 - New user)