Also I had these (dutch) translations ready.
#define UI_TEXT_ON_NL "Aan"
#define UI_TEXT_OFF_NL "Uit"
#define UI_TEXT_NA_NL "Nvt" // Output for not available
#define UI_TEXT_YES_NL "Ja"
#define UI_TEXT_NO_NL "Nee"
#define UI_TEXT_PRINT_POS_NL "Printen..."
#define UI_TEXT_PRINTING_NL "Printen"
#define UI_TEXT_IDLE_NL "Rust"
#define UI_TEXT_NOSDCARD_NL "Geen SD kaart"
#define UI_TEXT_ERROR_NL "**** FOUT ****"
#define UI_TEXT_BACK_NL "Terug " cUP
#define UI_TEXT_QUICK_SETTINGS_NL "Snelle instellingen"
#define UI_TEXT_ERRORMSG_NL "%oe"
#define UI_TEXT_CONFIGURATION_NL "Configuratie"
#define UI_TEXT_POSITION_NL "Positie"
#define UI_TEXT_EXTRUDER_NL "Extruder"
#define UI_TEXT_SD_CARD_NL "Print"
#define UI_TEXT_DEBUGGING_NL "Debugging"
#define UI_TEXT_HOME_DELTA_NL "Home delta"
#define UI_TEXT_HOME_ALL_NL "Home alles"
#define UI_TEXT_HOME_X_NL "Home X"
#define UI_TEXT_HOME_Y_NL "Home Y"
#define UI_TEXT_HOME_Z_NL "Home Z"
#define UI_TEXT_PREHEAT_PLA_NL "Voorverwarmen PLA"
#define UI_TEXT_PREHEAT_ABS_NL "Voorverwarmen ABS"
#define UI_TEXT_LIGHTS_ONOFF_NL "Lichten:%lo"
#define UI_TEXT_COOLDOWN_NL "Koel af"
#define UI_TEXT_SET_TO_ORIGIN_NL "Zet nulpunt"
#define UI_TEXT_DISABLE_STEPPER_NL "Zet motor uit"
#define UI_TEXT_X_POSITION_NL "X positie"
#define UI_TEXT_X_POS_FAST_NL "X pos. snel"
#define UI_TEXT_Y_POSITION_NL "Y positie"
#define UI_TEXT_Y_POS_FAST_NL "Y pos. snel"
#define UI_TEXT_Z_POSITION_NL "Z positie"
#define UI_TEXT_Z_POS_FAST_NL "Z pos. snel"
#define UI_TEXT_E_POSITION_NL "Extra positie"
#define UI_TEXT_BED_TEMP_NL "Bed temp:%eb/%Eb" cDEG "C"
#define UI_TEXT_EXTR0_TEMP_NL "Temp. 1 :%e0/%E0" cDEG "C"
#define UI_TEXT_EXTR1_TEMP_NL "Temp. 2 :%e1/%E1" cDEG "C"
#define UI_TEXT_EXTR2_TEMP_NL "Temp. 3 :%e2/%E2" cDEG "C"
#define UI_TEXT_EXTR0_OFF_NL "Extruder 1 uit"
#define UI_TEXT_EXTR1_OFF_NL "Extruder 2 uit"
#define UI_TEXT_EXTR2_OFF_NL "Extruder 3 uit"
#define UI_TEXT_EXTR0_SELECT_NL "%X0 Select extr. 1"
#define UI_TEXT_EXTR1_SELECT_NL "%X1 Select extr. 2"
#define UI_TEXT_EXTR2_SELECT_NL "%X2 Select extr. 3"
#define UI_TEXT_EXTR_ORIGIN_NL "Zet nulpunt"
#define UI_TEXT_PRINT_X_NL "Print X:%ax"
#define UI_TEXT_PRINT_Y_NL "Print Y:%ay"
#define UI_TEXT_PRINT_Z_NL "Print Z:%az"
#define UI_TEXT_PRINT_Z_DELTA_NL "Print:%az"
#define UI_TEXT_MOVE_X_NL "Beweeg X:%aX"
#define UI_TEXT_MOVE_Y_NL "Beweeg Y:%aY"
#define UI_TEXT_MOVE_Z_NL "Beweeg Z:%aZ"
#define UI_TEXT_MOVE_Z_DELTA_NL "Beweeg:%aZ"
#define UI_TEXT_JERK_NL "Ruk:%aj"
#define UI_TEXT_ZJERK_NL "Z-Ruk:%aJ"
#define UI_TEXT_ACCELERATION_NL "Acceleratie"
#define UI_TEXT_STORE_TO_EEPROM_NL "Opslaan naar EEPROM"
#define UI_TEXT_LOAD_EEPROM_NL "Laden van EEPROM"
#define UI_TEXT_DBG_ECHO_NL "Echo :%do"
#define UI_TEXT_DBG_INFO_NL "Info :%di"
#define UI_TEXT_DBG_ERROR_NL "Fouten :%de"
#define UI_TEXT_DBG_DRYRUN_NL "Droogloop:%dd"
#define UI_TEXT_DBG_ENDSTOP_NL "EndStop :%dp"
#define UI_TEXT_OPS_OFF_NL "%O0 OPS Uit"
#define UI_TEXT_OPS_CLASSIC_NL "%O1 OPS Klassiek"
#define UI_TEXT_OPS_FAST_NL "%O2 OPS Snel"
#define UI_TEXT_OPS_RETRACT_NL "Terugtrekken:%Or"
#define UI_TEXT_OPS_BACKSLASH_NL "Backsl. :%Ob"
#define UI_TEXT_OPS_MINDIST_NL "Min. afstand:%Od"
#define UI_TEXT_OPS_MOVE_AFTER_NL "Beweeg na:%Oa"
#define UI_TEXT_ANTI_OOZE_NL "Anti lek"
#define UI_TEXT_PRINT_FILE_NL "Print bestand"
#define UI_TEXT_PAUSE_PRINT_NL "Pauzeer print"
#define UI_TEXT_CONTINUE_PRINT_NL "Zet print voort"
#define UI_TEXT_UNMOUNT_CARD_NL "Ontkoppel kaart"
#define UI_TEXT_MOUNT_CARD_NL "Koppel kaart"
#define UI_TEXT_DELETE_FILE_NL "Verw. bestand"
#define UI_TEXT_FEEDRATE_NL "Beweeg snelheid"
#define UI_TEXT_FEED_MAX_X_NL "Max X:%fx"
#define UI_TEXT_FEED_MAX_Y_NL "Max Y:%fy"
#define UI_TEXT_FEED_MAX_Z_NL "Max Z:%fz"
#define UI_TEXT_FEED_MAX_Z_DELTA_NL "Max:%fz"
#define UI_TEXT_FEED_HOME_X_NL "Home X:%fX"
#define UI_TEXT_FEED_HOME_Y_NL "Home Y:%fY"
#define UI_TEXT_FEED_HOME_Z_NL "Home Z:%fZ"
#define UI_TEXT_FEED_HOME_Z_DELTA_NL "Home:%fZ"
#define UI_TEXT_ACTION_XPOSITION4A_NL "X:%x0 mm"
#define UI_TEXT_ACTION_XPOSITION4B_NL "Min eindst.:%sx"
#define UI_TEXT_ACTION_XPOSITION4C_NL "Max eindst.:%sX"
#define UI_TEXT_ACTION_XPOSITION4D_NL ""
#define UI_TEXT_ACTION_YPOSITION4A_NL "Y:%x1 mm"
#define UI_TEXT_ACTION_YPOSITION4B_NL "Min eindst.:%sy"
#define UI_TEXT_ACTION_YPOSITION4C_NL "Max eindst.:%sY"
#define UI_TEXT_ACTION_YPOSITION4D_NL ""
#define UI_TEXT_ACTION_ZPOSITION4A_NL "Z:%x2 mm"
#define UI_TEXT_ACTION_ZPOSITION4B_NL "Min eindst.:%sz"
#define UI_TEXT_ACTION_ZPOSITION4C_NL "Max eindst.:%sZ"
#define UI_TEXT_ACTION_ZPOSITION4D_NL ""
#define UI_TEXT_ACTION_XPOSITION_FAST4A_NL "X:%x0 mm"
#define UI_TEXT_ACTION_XPOSITION_FAST4B_NL "Min eindst.:%sx"
#define UI_TEXT_ACTION_XPOSITION_FAST4C_NL "Max eindst.:%sX"
#define UI_TEXT_ACTION_XPOSITION_FAST4D_NL ""
#define UI_TEXT_ACTION_YPOSITION_FAST4A_NL "Y:%x1 mm"
#define UI_TEXT_ACTION_YPOSITION_FAST4B_NL "Min eindst.:%sy"
#define UI_TEXT_ACTION_YPOSITION_FAST4C_NL "Max eindst.:%sY"
#define UI_TEXT_ACTION_YPOSITION_FAST4D_NL ""
#define UI_TEXT_ACTION_ZPOSITION_FAST4A_NL "Z:%x2 mm"
#define UI_TEXT_ACTION_ZPOSITION_FAST4B_NL "Min eindst.:%sz"
#define UI_TEXT_ACTION_ZPOSITION_FAST4C_NL "Max eindst.:%sZ"
#define UI_TEXT_ACTION_ZPOSITION_FAST4D_NL ""
#define UI_TEXT_ACTION_EPOSITION_FAST2A_NL "E:%x3 mm"
#define UI_TEXT_ACTION_EPOSITION_FAST2B_NL "1 klik = 1 mm"
#define UI_TEXT_ACTION_XPOSITION2A_NL "X:%x0 mm"
#define UI_TEXT_ACTION_XPOSITION2B_NL "Min:%sx Max:%sX"
#define UI_TEXT_ACTION_YPOSITION2A_NL "Y:%x1 mm"
#define UI_TEXT_ACTION_YPOSITION2B_NL "Min:%sy Max:%sY"
#define UI_TEXT_ACTION_ZPOSITION2A_NL "Z:%x2 mm"
#define UI_TEXT_ACTION_ZPOSITION2B_NL "Min:%sz Max:%sZ"
#define UI_TEXT_ACTION_XPOSITION_FAST2A_NL "X:%x0 mm"
#define UI_TEXT_ACTION_XPOSITION_FAST2B_NL "Min:%sx Max:%sX"
#define UI_TEXT_ACTION_YPOSITION_FAST2A_NL "Y:%x1 mm"
#define UI_TEXT_ACTION_YPOSITION_FAST2B_NL "Min:%sy Max:%sY"
#define UI_TEXT_ACTION_ZPOSITION_FAST2A_NL "Z:%x2 mm"
#define UI_TEXT_ACTION_ZPOSITION_FAST2B_NL "Min:%sz Max:%sZ"
#define UI_TEXT_FANSPEED_NL "Fan snelheid"
#define UI_TEXT_FAN_OFF_NL "Zet fan uit"
#define UI_TEXT_ACTION_FANSPEED_NL "Fan snelheid:%Fs%%%"
#define UI_TEXT_FAN_25_NL "Zet fan 25%%%"
#define UI_TEXT_FAN_50_NL "Zet fan 50%%%"
#define UI_TEXT_FAN_75_NL "Zet fan 75%%%"
#define UI_TEXT_FAN_FULL_NL "Zet fan vol aan"
#define UI_TEXT_STEPPER_INACTIVE_NL "Motor inactief"
#define UI_TEXT_STEPPER_INACTIVE2A_NL "Uit na: %is"
#define UI_TEXT_STEPPER_INACTIVE2B_NL "[min] 0=Off"
#define UI_TEXT_POWER_INACTIVE_NL "Max. inactief"
#define UI_TEXT_POWER_INACTIVE2A_NL "Zet uit na: %ip"
#define UI_TEXT_POWER_INACTIVE2B_NL "[min] 0=Off"
#define UI_TEXT_GENERAL_NL "Algemeen"
#define UI_TEXT_BAUDRATE_NL "Baudrate:%oc"
#define UI_TEXT_EXTR_STEPS_NL "Stappen/MM:%Se"
#define UI_TEXT_EXTR_START_FEED_NL "Start sn.:%Xf"
#define UI_TEXT_EXTR_MAX_FEED_NL "Max sn.:%XF"
#define UI_TEXT_EXTR_ACCEL_NL "Accel:%XA"
#define UI_TEXT_EXTR_WATCH_NL "Stab.tijd:%Xw"
#define UI_TEXT_EXTR_ADVANCE_L_NL "Advance lin:%Xl"
#define UI_TEXT_EXTR_ADVANCE_K_NL "Advance quad:%Xa"
#define UI_TEXT_EXTR_MANAGER_NL "Control:%Xh"
#define UI_TEXT_EXTR_PGAIN_NL "PID P:%Xp"
#define UI_TEXT_EXTR_DEADTIME_NL "Dode tijd:%Xp"
#define UI_TEXT_EXTR_DMAX_DT_NL "Controle PWM:%XM"
#define UI_TEXT_EXTR_IGAIN_NL "PID I:%Xi"
#define UI_TEXT_EXTR_DGAIN_NL "PID D:%Xd"
#define UI_TEXT_EXTR_DMIN_NL "Drive min:%Xm"
#define UI_TEXT_EXTR_DMAX_NL "Drive max:%XM"
#define UI_TEXT_EXTR_PMAX_NL "PID max:%XD"
#define UI_TEXT_EXTR_XOFF_NL "X-Offset:%Xx"
#define UI_TEXT_EXTR_YOFF_NL "Y-Offset:%Xy"
#define UI_TEXT_EXTR_ZOFF_NL "Z-Offset:%Xz"
#define UI_TEXT_STRING_HM_BANGBANG_NL "BangBang"
#define UI_TEXT_STRING_HM_PID_NL "PID"
#define UI_TEXT_STRING_ACTION_NL "Actie:%la"
#define UI_TEXT_HEATING_EXTRUDER_NL "Opwarmen extr."
#define UI_TEXT_HEATING_BED_NL "Opwarmen bed"
#define UI_TEXT_KILLED_NL "Uitgeschakeld"
#define UI_TEXT_STEPPER_DISABLED_NL "Motor uitgezet"
#define UI_TEXT_EEPROM_STOREDA_NL "Configuratie"
#define UI_TEXT_EEPROM_STOREDB_NL "Opgeslagen in EEPROM"
#define UI_TEXT_EEPROM_LOADEDA_NL "Configuratie"
#define UI_TEXT_EEPROM_LOADEDB_NL "EEPROM ingeladen"
#define UI_TEXT_UPLOADING_NL "Uploaden..."
#define UI_TEXT_PAGE_BUFFER_NL "Buffer:%oB"
#define UI_TEXT_PAGE_EXTRUDER_NL " E:%ec/%Ec" cDEG "C" cARROW "%oC"
#define UI_TEXT_PAGE_EXTRUDER1_NL "E1:%e0/%E0" cDEG "C" cARROW "%o0"
#define UI_TEXT_PAGE_EXTRUDER2_NL "E2:%e1/%E1" cDEG "C" cARROW "%o1"
#define UI_TEXT_PAGE_EXTRUDER3_NL "E3:%e2/%E2" cDEG "C" cARROW "%o2"
#define UI_TEXT_PAGE_BED_NL " B:%eb/%Eb" cDEG "C" cARROW "%ob"
#define UI_TEXT_SPEED_MULTIPLY_NL "Snelh. mul.:%om%%%"
#define UI_TEXT_FLOW_MULTIPLY_NL "Flow mul.:%of%%%"
#define UI_TEXT_SHOW_MEASUREMENT_NL "Laat meting zien"
#define UI_TEXT_RESET_MEASUREMENT_NL "Herstel meting"
#define UI_TEXT_SET_MEASURED_ORIGIN_NL "Zet Z=0"
#define UI_TEXT_ZCALIB_NL "Z calib."
#define UI_TEXT_SET_P1_NL "Zet P1"
#define UI_TEXT_SET_P2_NL "Zet P2"
#define UI_TEXT_SET_P3_NL "Zet P3"
#define UI_TEXT_CALCULATE_LEVELING_NL "Bereken leveling"
#define UI_TEXT_LEVEL_NL "Level delta"
#define UI_TEXT_EXTR_WAIT_RETRACT_TEMP_NL "Wacht temp. %XT" cDEG "C"
#define UI_TEXT_EXTR_WAIT_RETRACT_UNITS_NL "Wacht retr.:%XU mm"
#define UI_TEXT_SD_REMOVED_NL "SD-kaart verwijderd"
#define UI_TEXT_SD_INSERTED_NL "SD-kaart geplaatst"
#define UI_TEXT_PRINTER_READY_NL "Printer klaar."
// Printtime output gets aggregated like <Days_5gisgits>UI_TEXT_PRINTTIME_DAYS<Hours>UI_TEXT_PRINTTIME_HOURS<Minutes>UI_TEXT_PRINTTIME_MINUTES
// ___88 days 12:45
#define UI_TEXT_PRINTTIME_DAYS_NL " dagen "
#define UI_TEXT_PRINTTIME_HOURS_NL ":"
#define UI_TEXT_PRINTTIME_MINUTES_NL ""
#define UI_TEXT_PRINT_TIME_NL "Print tijd"
#define UI_TEXT_PRINT_FILAMENT_NL "Filament geprint"
#define UI_TEXT_PRINTED_NL "geprint"
#define UI_TEXT_POWER_NL "ATX power aan/uit"
#define UI_TEXT_STRING_HM_DEADTIME_NL "Dode tijd"
#define UI_TEXT_STRING_HM_SLOWBANG_NL "SlowBang"
#define UI_TEXT_STOP_PRINT_NL "Stop print"
#define UI_TEXT_Z_BABYSTEPPING_NL "Z babystep.:%oYmm"
#define UI_TEXT_CHANGE_FILAMENT_NL "Wissel filament"
#define UI_TEXT_WIZ_CH_FILAMENT1_NL "Wissel filament:"
#define UI_TEXT_WIZ_CH_FILAMENT2_NL "Draai filament"
#define UI_TEXT_WIZ_CH_FILAMENT3_NL "uit/in met knop"
#define UI_TEXT_CLICK_DONE_NL "Ga verder met klik"
#define UI_TEXT_AUTOLEVEL_ONOFF_NL "Autolevel: %ll"
#define UI_TEXT_SERVOPOS_NL "Servo-pos.: %oS"
#define UI_TEXT_IGNORE_M106_NL "Negeer M106 %Fi"
#define UI_TEXT_WIZ_REHEAT1_NL "Klik om extruder"
#define UI_TEXT_WIZ_REHEAT2_NL "te verwarmen."
#define UI_TEXT_WIZ_WAITTEMP1_NL "Wachten op"
#define UI_TEXT_WIZ_WAITTEMP2_NL "doeltemperatuur..."
#define UI_TEXT_EXTRUDER_JAM_NL "Extruder jam"
#define UI_TEXT_STANDBY_NL "Standby"
#define UI_TEXT_BED_COATING_NL "Bed bedekking"
#define UI_TEXT_BED_COATING_SET1_NL "Bed ingesteld op"
#define UI_TEXT_BED_COATING_SET2_NL ""
#define UI_TEXT_NOCOATING_NL "Geen bedekking"
#define UI_TEXT_BUILDTAK_NL "BuildTak"
#define UI_TEXT_KAPTON_NL "Kapton"
#define UI_TEXT_BLUETAPE_NL "Blauw afplakband"
#define UI_TEXT_PETTAPE_NL "Groene PET Tape"
#define UI_TEXT_GLUESTICK_NL "Lijmstift"
#define UI_TEXT_CUSTOM_NL "Custom"
#define UI_TEXT_COATING_CUSTOM_NL "Custom:%BCmm"
#define UI_TEXT_LANGUAGE_NL "Taal"
#if NUM_EXTRUDER > 2 || MIXING_EXTRUDER != 0
#define UI_TEXT_MAINPAGE6_1_NL "\xa %ec/%Ec\xb0 X:%x0"
#else
#define UI_TEXT_MAINPAGE6_1_NL "\xa %e0/%E0\xb0 X:%x0"
#endif // NUM_EXTRUDER
#if NUM_EXTRUDER == 2 && MIXING_EXTRUDER == 0
#define UI_TEXT_MAINPAGE6_2_NL "\xa %e1/%E1\xb0 Y:%x1"
#else
#define UI_TEXT_MAINPAGE6_2_NL "\xe %eb/%Eb\xb0 Y:%x1"
#endif
#if NUM_EXTRUDER == 2 && MIXING_EXTRUDER == 0
#define UI_TEXT_MAINPAGE6_3_NL "\xe %eb/%Eb\xb0 Z:%x2"
#elif FEATURE_DITTO_PRINTING
#define UI_TEXT_MAINPAGE6_3_NL "Kopieen: %ed Z:%x2"
#else
#define UI_TEXT_MAINPAGE6_3_NL "Flow:\xfd %of%%% Z:%x2"
#endif
#define UI_TEXT_MAINPAGE6_4_NL "Mul: %om%%% \xfd E: %x4m"
#define UI_TEXT_MAINPAGE6_5_NL "Buf: %oB"
#define UI_TEXT_MAINPAGE6_6_NL "%os"
#define UI_TEXT_MAINPAGE_TEMP_BED_NL cTEMP "%ec/%Ec" cDEG "B%eB/%Eb" cDEG
#define UI_TEXT_MAINPAGE_BED_NL "B%eB/%Eb" cDEG
#define UI_TEXT_MAINPAGE_Z_BUF_NL "Z:%x2 Buf : %oB"
#define UI_TEXT_MAINPAGE_MUL_EUSAGE_NL "Mul: %om E:%x4"
#define UI_TEXT_MAINPAGE_XY_NL "X:%x0 Y:%x1"
#define UI_TEXT_PRINT_TIME_VALUE_NL "%Ut"
#define UI_TEXT_PRINT_FILAMENT_VALUE_NL "%Uf m"
#define UI_TEXT_METER_PRINTED_NL "%Uf m " UI_TEXT_PRINTED_NL
#define UI_TEXT_STATUS_NL "%os"
#define UI_TEXT_EMPTY_NL ""
#define UI_TEXT_TEMP_SET_NL cTEMP "%ec/%Ec" cDEG
#define UI_TEXT_CURRENT_TEMP_NL cTEMP "%ec" cDEG
#define UI_TEXT_COATING_THICKNESS_NL " %BCmm"
#define UI_TEXT_EXTR3_TEMP_NL "Temp. 4 :%e3/%E3" cDEG "C"
#define UI_TEXT_EXTR4_TEMP_NL "Temp. 5 :%e4/%E4" cDEG "C"
#define UI_TEXT_EXTR5_TEMP_NL "Temp. 6 :%e5/%E5" cDEG "C"
#define UI_TEXT_EXTR3_OFF_NL "Extruder 4 Uit"
#define UI_TEXT_EXTR4_OFF_NL "Extruder 5 Uit"
#define UI_TEXT_EXTR5_OFF_NL "Extruder 6 Uit"
#define UI_TEXT_EXTR3_SELECT_NL "%X3 Select Extr. 4"
#define UI_TEXT_EXTR4_SELECT_NL "%X4 Select Extr. 5"
#define UI_TEXT_EXTR5_SELECT_NL "%X5 Select Extr. 6"
#define UI_TEXT_DITTO_0_NL "%D0 Geen Kopieen"
#define UI_TEXT_DITTO_1_NL "%D1 1 Kopie"
#define UI_TEXT_DITTO_2_NL "%D2 2 Kopie??n"
#define UI_TEXT_DITTO_3_NL "%D3 3 Kopie??n"
#define UI_TEXT_ZPROBE_HEIGHT_NL "Z-probe hoogte:%zh"