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/wisweb/public_html/management/dev/translation/../../htdocs/langs/en_US/ - 95 found

#StringFile and lines
31NewAssetTypeassets.lang (24 - New asset type) (64 - New asset type)
52NotTheAssignedApproverholiday.lang (75 - You are not the assigned approver) (99 - You are not the assigned approver)
93Receptionreceptions.lang (4 - Reception) (7 - Product reception)
94Receptionsreceptions.lang (5 - Receptions) (8 - Reception)
2ByYearaccountancy.lang (192 - By year)
main.lang (776 - By year)
28Eventsagenda.lang (12 - Events)
main.lang (880 - Events)
53IncotermLabelincoterm.lang (3 - Incoterms)
main.lang (894 - Incoterms)
55StatusInterInvoicedinterventions.lang (30 - Billed)
main.lang (495 - Invoiced)
56Closedmain.lang (142 - Closed)
ticket.lang (66 - Closed)
57NewObjectmain.lang (211 - New %s)
modulebuilder.lang (9 - New object)
58Typemain.lang (215 - Type)
ticket.lang (70 - Type)
59MulticurrencyPaymentAmountmain.lang (358 - Payment amount, original currency)
multicurrency.lang (19 - Payment amount, original currency)
60Categorymain.lang (472 - Tag/category)
ticket.lang (71 - Analytic code)
61OpenAllmain.lang (498 - Open (All))
stocks.lang (150 - Open for all actions)
62NotReadmain.lang (649 - Not read)
ticket.lang (59 - Not read)
4InternalUseradmin.lang (48 - Internal user)
users.lang (68 - Internal user)
5NewModuleadmin.lang (207 - New)
modulebuilder.lang (8 - New module)
6NoticePeriodadmin.lang (265 - Notice period)
holiday.lang (111 - Notice period)
7LanguageFileadmin.lang (362 - Language file)
modulebuilder.lang (50 - File for language)
8PriceFormatInCurrentLanguageadmin.lang (403 - Price Format In Current Language)
companies.lang (31 - Price display format in the current language and currency)
9Stringadmin.lang (404 - String)
members.lang (101 - String)
10Intadmin.lang (407 - Integer)
members.lang (103 - Int)
11DateAndTimeadmin.lang (409 - Date and hour)
members.lang (104 - Date and time)
12Fieldadmin.lang (479 - Field)
blockedlog.lang (2 - Field)
exports.lang (60 - Field)
13Module62000Nameadmin.lang (649 - Incoterms)
incoterm.lang (1 - Incoterm)
14Module62000Descadmin.lang (650 - Add features to manage Incoterms)
incoterm.lang (2 - Add features to manage Incoterm)
15Upgradeadmin.lang (1014 - Upgrade)
install.lang (104 - Upgrade)
16Serveradmin.lang (1025 - Server)
install.lang (49 - Server)
17DatabaseServeradmin.lang (1027 - Database host)
install.lang (52 - Database server)
18DatabaseNameadmin.lang (1028 - Database name)
install.lang (53 - Database name)
19DriverTypeadmin.lang (1036 - Driver type)
install.lang (48 - Driver type)
20CompanyNameadmin.lang (1057 - Name)
companies.lang (26 - Company name)
21WithdrawalsSetupadmin.lang (1537 - Setup of module Direct Debit payments)
withdrawals.lang (22 - Direct debit payment setup)
22Buyadmin.lang (1618 - Buy)
products.lang (50 - Purchase)
23Selladmin.lang (1619 - Sell)
products.lang (49 - Sell)
24AccountancyCodeadmin.lang (1622 - Accounting Code)
companies.lang (304 - Accounting account)
25CashDeskadmin.lang (1645 - Point of Sale)
cashdesk.lang (3 - Point of sale)
26ByDefaultInListadmin.lang (1792 - Show by default on list view)
categories.lang (89 - By default in list)
1LineIdaccountancy.lang (124 - Id line)
exports.lang (41 - Id of line)
3CustomerInvoicePaymentaccountancy.lang (208 - Payment of invoice customer)
banks.lang (100 - Customer payment)
27AffectedToagenda.lang (10 - Assigned to)
projects.lang (111 - Allocated to)
29Locationagenda.lang (16 - Location)
stocks.lang (34 - Location)
30InterventionSentByEMailagenda.lang (82 - Intervention %s sent by email)
interventions.lang (38 - Intervention %s sent by email)
32DeleteTypeassets.lang (29 - Delete)
members.lang (76 - Delete)
33ShowTypeCardassets.lang (32 - Show type '%s')
members.lang (144 - Show type '%s')
34IBANbanks.lang (32 - IBAN number)
bills.lang (431 - IBAN)
35BICbanks.lang (33 - BIC/SWIFT code)
bills.lang (432 - BIC/SWIFT)
36StandingOrdersbanks.lang (38 - Direct Debit orders)
bills.lang (234 - Direct debit orders)
37StandingOrderbanks.lang (39 - Direct debit order)
bills.lang (235 - Direct debit order)
38Accountbanks.lang (64 - Account)
compta.lang (15 - Account)
39SubscriptionPaymentbanks.lang (102 - Subscription payment)
members.lang (158 - Subscription payment)
40NoSupplierOrderboxes.lang (67 - No recorded purchase order)
orders.lang (78 - No purchase order)
41ShowCompanycashdesk.lang (29 - Show company)
companies.lang (320 - Show Third Party)
42Historycashdesk.lang (66 - History)
suppliers.lang (6 - History)
43DeleteFromCatcategories.lang (82 - Remove from tags/category)
compta.lang (247 - Remove from accounting group)
44Customercommercial.lang (4 - Customer)
companies.lang (266 - Customer)
45Prospectcommercial.lang (6 - Prospect)
companies.lang (264 - Prospect)
propal.lang (12 - Prospect)
46ShowTaskcommercial.lang (18 - Show task)
projects.lang (39 - Show task)
47ToPaycompta.lang (66 - To pay)
paybox.lang (14 - Do payment)
48ContractStatusClosedcontracts.lang (9 - Closed)
products.lang (78 - Closed)
49ExportsAreaexports.lang (2 - Exports)
other.lang (255 - Exports area)
50ExportableDatasexports.lang (6 - Exportable dataset)
other.lang (259 - Exportable data)
51AvailableFormatsexports.lang (27 - Available Formats)
other.lang (256 - Available formats)
54CreateUserinstall.lang (60 - Create user account or grant user account permission on the Dolibarr database)
users.lang (30 - Create user)
63OrderDateorders.lang (10 - Order date)
suppliers.lang (9 - Order date)
64CreatedByother.lang (109 - Created by %s)
ticket.lang (149 - Created by)
65FollowingUrlAreAvailableToMakePaymentspaybox.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)
66PaymentFormpaybox.lang (5 - Payment form)
stripe.lang (6 - Payment form)
67WelcomeOnPaymentPagepaybox.lang (6 - Welcome to our online payment service)
stripe.lang (7 - Welcome to our online payment service)
68ThisScreenAllowsYouToPaypaybox.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.)
69ThisIsInformationOnPaymentpaybox.lang (8 - This is information on payment to do)
stripe.lang (9 - This is information on payment to do)
70ToCompletepaybox.lang (9 - To complete)
stripe.lang (10 - To complete)
71YourEMailpaybox.lang (10 - Email to receive payment confirmation)
stripe.lang (11 - Email to receive payment confirmation)
72Creditorpaybox.lang (11 - Creditor)
stripe.lang (13 - Creditor)
73PaymentCodepaybox.lang (12 - Payment code)
stripe.lang (14 - Payment code)
74Continuepaybox.lang (16 - Next)
stripe.lang (17 - Next)
75ToOfferALinkForOnlinePaymentpaybox.lang (17 - URL for %s payment)
stripe.lang (18 - URL for %s payment)
76ToOfferALinkForOnlinePaymentOnOrderpaybox.lang (18 - URL to offer a %s online payment user interface for a sales order)
stripe.lang (19 - URL to offer a %s online payment user interface for a sales order)
77ToOfferALinkForOnlinePaymentOnInvoicepaybox.lang (19 - URL to offer a %s online payment user interface for a customer invoice)
stripe.lang (20 - URL to offer a %s online payment user interface for a customer invoice)
78ToOfferALinkForOnlinePaymentOnContractLinepaybox.lang (20 - URL to offer a %s online payment user interface for a contract line)
stripe.lang (21 - URL to offer a %s online payment user interface for a contract line)
79ToOfferALinkForOnlinePaymentOnFreeAmountpaybox.lang (21 - URL to offer a %s online payment user interface for a free amount)
stripe.lang (22 - URL to offer a %s online payment user interface for a free amount)
80ToOfferALinkForOnlinePaymentOnMemberSubscriptionpaybox.lang (22 - URL to offer a %s online payment user interface for a member subscription)
stripe.lang (23 - URL to offer a %s online payment user interface for a member subscription)
81YouCanAddTagOnUrlpaybox.lang (24 - You can also add url parameter <b>&tag)
stripe.lang (24 - You can also add url parameter <b>&tag)
82AccountParameterpaybox.lang (28 - Account parameters)
stripe.lang (26 - Account parameters)
83UsageParameterpaybox.lang (29 - Usage parameters)
stripe.lang (27 - Usage parameters)
84InformationToFindParameterspaybox.lang (30 - Help to find your %s account information)
stripe.lang (28 - Help to find your %s account information)
85VendorNamepaybox.lang (32 - Name of vendor)
stripe.lang (30 - Name of vendor)
86CSSUrlForPaymentFormpaybox.lang (33 - CSS style sheet url for payment form)
stripe.lang (31 - CSS style sheet url for payment form)
87Stockproducts.lang (45 - Stock)
stocks.lang (18 - Stock)
88Stocksproducts.lang (47 - Stocks and location (warehouse) of products)
stocks.lang (19 - Stocks)
89Movementsproducts.lang (48 - Movements)
stocks.lang (23 - Movements)
90Suppliersproducts.lang (83 - Vendors)
suppliers.lang (2 - Vendors)
91ListOfStockMovementsproducts.lang (90 - List of stock movements)
stocks.lang (26 - List of stock movements)
92Unitproducts.lang (165 - Unit)
stocks.lang (41 - Unit)
95NewUserticket.lang (271 - New user)
users.lang (29 - New user)