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/r1gtinfo/public_html/revisar/dolibarr6_/dev/translation/../../htdocs/langs/en_US/ - 82 found

#StringFile and lines
48CurrentValuemain.lang (203 - Current value) (625 - Current Value)
11Browseradmin.lang (939 - Browser)
main.lang (646 - Browser)
26Eventsagenda.lang (12 - Events)
main.lang (799 - Events)
47NewObjectmain.lang (201 - New %s)
modulebuilder.lang (8 - New object)
49MulticurrencyPaymentAmountmain.lang (337 - Payment amount, original currency)
multicurrency.lang (19 - Payment amount, original currency)
4InternalUseradmin.lang (46 - Internal user)
users.lang (65 - Internal user)
5NoticePeriodadmin.lang (247 - Notice period)
holiday.lang (90 - Notice period)
6Stringadmin.lang (376 - String)
members.lang (98 - String)
7Intadmin.lang (378 - Integer)
members.lang (100 - Int)
8DateAndTimeadmin.lang (380 - Date and hour)
members.lang (101 - Date and time)
9Fieldadmin.lang (447 - Field)
blockedlog.lang (2 - Field)
exports.lang (60 - Field)
10Upgradeadmin.lang (928 - Upgrade)
install.lang (100 - Upgrade)
12Serveradmin.lang (940 - Server)
install.lang (46 - Server)
13DatabaseServeradmin.lang (942 - Database host)
install.lang (49 - Database server)
14DatabaseNameadmin.lang (943 - Database name)
install.lang (50 - Database name)
15DriverTypeadmin.lang (951 - Driver type)
install.lang (45 - Driver type)
16CompanyNameadmin.lang (972 - Name)
companies.lang (26 - Company name)
17CreditNoteadmin.lang (1173 - Credit note)
bills.lang (271 - Credit note)
18CreditNotesadmin.lang (1174 - Credit notes)
bills.lang (272 - Credit notes)
19WithdrawalsSetupadmin.lang (1422 - Setup of module Direct debit payment orders)
withdrawals.lang (22 - Direct debit payment setup)
20Buyadmin.lang (1506 - Buy)
products.lang (45 - Purchases)
21Selladmin.lang (1507 - Sell)
products.lang (44 - Sales)
22AccountancyCodeadmin.lang (1510 - Accountancy Code)
companies.lang (289 - Accounting account)
23CashDeskadmin.lang (1532 - Point of sales)
cashdesk.lang (3 - Point of sale)
24ByDefaultInListadmin.lang (1669 - Show by default on list view)
categories.lang (87 - By default in list)
1LineIdaccountancy.lang (105 - Id line)
exports.lang (41 - Id of line)
2CustomerInvoicePaymentaccountancy.lang (171 - Payment of invoice customer)
banks.lang (95 - Customer payment)
3Natureaccountancy.lang (223 - Nature)
members.lang (155 - Nature)
products.lang (157 - Nature)
25AffectedToagenda.lang (10 - Assigned to)
projects.lang (100 - Allocated to)
27Locationagenda.lang (15 - Location)
stocks.lang (28 - Location)
28InterventionSentByEMailagenda.lang (74 - Intervention %s sent by EMail)
interventions.lang (39 - Intervention %s sent by EMail)
29IBANbanks.lang (29 - IBAN number)
bills.lang (396 - IBAN)
30BICbanks.lang (30 - BIC/SWIFT number)
bills.lang (397 - BIC/SWIFT)
31StandingOrdersbanks.lang (35 - Direct Debit orders)
bills.lang (218 - Direct debit orders)
withdrawals.lang (4 - Direct debit payment orders)
32StandingOrderbanks.lang (36 - Direct debit order)
bills.lang (219 - Direct debit order)
withdrawals.lang (5 - Direct debit payment order)
33Accountbanks.lang (61 - Account)
compta.lang (15 - Account)
34SubscriptionPaymentbanks.lang (97 - Subscription payment)
members.lang (139 - Subscription payment)
35Paymentsbills.lang (60 - Payments)
compta.lang (79 - Payments)
36InvoiceRefbills.lang (295 - Invoice ref.)
compta.lang (187 - Invoice ref.)
37NoSupplierOrderboxes.lang (67 - No recorded supplier order)
orders.lang (77 - No supplier order)
38ShowCompanycashdesk.lang (29 - Show company)
companies.lang (305 - Show third party)
39Customercommercial.lang (4 - Customer)
companies.lang (261 - Customer)
40Prospectcommercial.lang (6 - Prospect)
companies.lang (259 - Prospect)
propal.lang (12 - Prospect)
41ToPaycompta.lang (62 - To pay)
paybox.lang (14 - Do payment)
42ContractStatusClosedcontracts.lang (9 - Closed)
products.lang (71 - Closed)
43ExportsAreaexports.lang (2 - Exports area)
other.lang (222 - Exports area)
44ExportableDatasexports.lang (6 - Exportable dataset)
other.lang (226 - Exportable data)
45AvailableFormatsexports.lang (27 - Available formats)
other.lang (223 - Available formats)
46CreateUserinstall.lang (56 - Create owner or grant him permission on database)
users.lang (29 - Create user)
50OrderDateorders.lang (9 - Order date)
suppliers.lang (9 - Order date)
51FollowingUrlAreAvailableToMakePaymentspaybox.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)
52PaymentFormpaybox.lang (5 - Payment form)
stripe.lang (6 - Payment form)
53WelcomeOnPaymentPagepaybox.lang (6 - Welcome on our online payment service)
stripe.lang (7 - Welcome on our online payment service)
54ThisScreenAllowsYouToPaypaybox.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.)
55ThisIsInformationOnPaymentpaybox.lang (8 - This is information on payment to do)
stripe.lang (9 - This is information on payment to do)
56ToCompletepaybox.lang (9 - To complete)
stripe.lang (10 - To complete)
57YourEMailpaybox.lang (10 - Email to receive payment confirmation)
stripe.lang (11 - Email to receive payment confirmation)
58Creditorpaybox.lang (11 - Creditor)
stripe.lang (13 - Creditor)
59PaymentCodepaybox.lang (12 - Payment code)
stripe.lang (14 - Payment code)
60Continuepaybox.lang (16 - Next)
stripe.lang (17 - Next)
61ToOfferALinkForOnlinePaymentpaybox.lang (17 - URL for %s payment)
stripe.lang (18 - URL for %s payment)
62ToOfferALinkForOnlinePaymentOnOrderpaybox.lang (18 - URL to offer a %s online payment user interface for a customer order)
stripe.lang (19 - URL to offer a %s online payment user interface for a customer order)
63ToOfferALinkForOnlinePaymentOnInvoicepaybox.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)
64ToOfferALinkForOnlinePaymentOnContractLinepaybox.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)
65ToOfferALinkForOnlinePaymentOnFreeAmountpaybox.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)
66ToOfferALinkForOnlinePaymentOnMemberSubscriptionpaybox.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)
67YouCanAddTagOnUrlpaybox.lang (23 - You can also add url parameter <b>&tag)
stripe.lang (24 - You can also add url parameter <b>&tag)
68YourPaymentHasBeenRecordedpaybox.lang (25 - This page confirms that your payment has been recorded. Thank you.)
stripe.lang (26 - This page confirms that your payment has been recorded. Thank you.)
69YourPaymentHasNotBeenRecordedpaybox.lang (26 - You payment has not been recorded and transaction has been canceled. Thank you.)
stripe.lang (27 - You payment has not been recorded and transaction has been canceled. Thank you.)
70AccountParameterpaybox.lang (27 - Account parameters)
stripe.lang (28 - Account parameters)
71UsageParameterpaybox.lang (28 - Usage parameters)
stripe.lang (29 - Usage parameters)
72InformationToFindParameterspaybox.lang (29 - Help to find your %s account information)
stripe.lang (30 - Help to find your %s account information)
73VendorNamepaybox.lang (31 - Name of vendor)
stripe.lang (32 - Name of vendor)
74CSSUrlForPaymentFormpaybox.lang (32 - CSS style sheet url for payment form)
stripe.lang (33 - CSS style sheet url for payment form)
75MessageOKpaybox.lang (33 - Message on validated payment return page)
stripe.lang (34 - Message on validated payment return page)
76MessageKOpaybox.lang (34 - Message on canceled payment return page)
stripe.lang (35 - Message on canceled payment return page)
77Stockproducts.lang (41 - Stock)
stocks.lang (16 - Stock)
78Stocksproducts.lang (42 - Stocks)
stocks.lang (17 - Stocks)
79Movementsproducts.lang (43 - Movements)
stocks.lang (21 - Movements)
80Suppliersproducts.lang (76 - Suppliers)
suppliers.lang (2 - Suppliers)
81ListOfStockMovementsproducts.lang (83 - List of stock movements)
stocks.lang (24 - List of stock movements)
82Unitproducts.lang (159 - Unit)
stocks.lang (35 - Unit)