fix: Reduce flash usage by cleaning up I18n translations (#1401)

## Summary

* **What is the goal of this PR?** 
Removing no longer used i18n keys/string, to reduce (~28k) used flash
space.
To correct to swedish translations for `STR_FONT_SIZE` and
`STR_KOREADER_SYNC`.

* **What changes are included?**
   `lib\I18n\translations\*`

## Additional Context

* Add any other information that might be helpful for the reviewer
(e.g., performance implications, potential risks,
  specific areas to focus on).

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**NO**_

lib/I18n/translations/dutch.yaml

@@ -9,11 +9,9 @@ STR_ENTERING_SLEEP: "Gaat in slaapstand"
 STR_BROWSE_FILES: "Bestanden bladeren"
 STR_FILE_TRANSFER: "Bestandsoverdracht"
 STR_SETTINGS_TITLE: "Instellingen"
-STR_CALIBRE_LIBRARY: "Calibre Bibliotheek"
 STR_CONTINUE_READING: "Verder lezen"
 STR_NO_OPEN_BOOK: "Geen geopend boek"
 STR_START_READING: "Begin hieronder met lezen"
-STR_BOOKS: "Boeken"
 STR_NO_FILES_FOUND: "Geen bestanden gevonden"
 STR_SELECT_CHAPTER: "Selecteer hoofdstuk"
 STR_NO_CHAPTERS: "Geen hoofdstukken"
@@ -26,10 +24,6 @@ STR_EMPTY_FILE: "Leeg bestand"
 STR_OUT_OF_BOUNDS: "Buiten bereik"
 STR_LOADING: "Laden..."
 STR_LOADING_POPUP: "Laden"
-STR_LOAD_XTC_FAILED: "Laden XTC mislukt"
-STR_LOAD_TXT_FAILED: "Laden TXT mislukt"
-STR_LOAD_EPUB_FAILED: "Laden EPUB mislukt"
-STR_SD_CARD_ERROR: "SD-kaart fout"
 STR_WIFI_NETWORKS: "Wifi-netwerken"
 STR_NO_NETWORKS: "Geen netwerken gevonden"
 STR_NETWORKS_FOUND: "%zu netwerken gevonden"
@@ -37,14 +31,9 @@ STR_SCANNING: "Scannen..."
 STR_CONNECTING: "Verbinden..."
 STR_CONNECTED: "Verbonden!"
 STR_CONNECTION_FAILED: "Verbinding mislukt"
-STR_CONNECTION_TIMEOUT: "Verbindingstime-out"
 STR_FORGET_NETWORK: "Netwerk vergeten?"
 STR_SAVE_PASSWORD: "Wachtwoord opslaan voor volgende keer?"
-STR_REMOVE_PASSWORD: "Opgeslagen wachtwoord verwijderen?"
 STR_PRESS_OK_SCAN: "Druk op OK om opnieuw te scannen"
-STR_PRESS_ANY_CONTINUE: "Druk op een knop om door te gaan"
-STR_SELECT_HINT: "LINKS/RECHTS: Selecteer | OK: Bevestig"
-STR_HOW_CONNECT: "Hoe wil je verbinding maken?"
 STR_JOIN_NETWORK: "Verbind met netwerk"
 STR_CREATE_HOTSPOT: "Hotspot maken"
 STR_JOIN_DESC: "Verbind met een bestaand wifi-netwerk"
@@ -57,27 +46,13 @@ STR_OR_HTTP_PREFIX: "of http://"
 STR_SCAN_QR_HINT: "of scan de QR-code met je telefoon:"
 STR_CALIBRE_WIRELESS: "Calibre Wireless"
 STR_CALIBRE_WEB_URL: "Calibre Web URL"
-STR_CONNECT_WIRELESS: "Verbind als draadloos apparaat"
 STR_NETWORK_LEGEND: "* = Beveiligd | + = Opgeslagen"
 STR_MAC_ADDRESS: "MAC-adres:"
 STR_CHECKING_WIFI: "Wifi controleren..."
 STR_ENTER_WIFI_PASSWORD: "Voer wifi-wachtwoord in"
-STR_ENTER_TEXT: "Tekst invoeren"
 STR_TO_PREFIX: "met "
-STR_CALIBRE_DISCOVERING: "Calibre zoeken..."
-STR_CALIBRE_CONNECTING_TO: "Verbinden met "
-STR_CALIBRE_CONNECTED_TO: "Verbonden met "
-STR_CALIBRE_WAITING_COMMANDS: "Wachten op opdrachten..."
-STR_CONNECTION_FAILED_RETRYING: "(Verbinding mislukt, opnieuw proberen)"
-STR_CALIBRE_DISCONNECTED: "Calibre verbinding verbroken"
-STR_CALIBRE_WAITING_TRANSFER: "Wachten op overdracht..."
-STR_CALIBRE_TRANSFER_HINT: "Als de overdracht mislukt, schakel dan\\n'Ignore free space' in bij de Calibre\\nSmartDevice plugin instellingen."
 STR_CALIBRE_RECEIVING: "Bezig met ontvangen: "
 STR_CALIBRE_RECEIVED: "Ontvangen: "
-STR_CALIBRE_WAITING_MORE: "Wachten op meer..."
-STR_CALIBRE_FAILED_CREATE_FILE: "Bestand aanmaken mislukt"
-STR_CALIBRE_PASSWORD_REQUIRED: "Wachtwoord vereist"
-STR_CALIBRE_TRANSFER_INTERRUPTED: "Overdracht onderbroken"
 STR_CALIBRE_INSTRUCTION_1: "1) Installeer CrossPoint Reader plugin"
 STR_CALIBRE_INSTRUCTION_2: "2) Gebruik hetzelfde wifi-netwerk"
 STR_CALIBRE_INSTRUCTION_3: "3) In Calibre: \"Send to device\""
@@ -88,37 +63,25 @@ STR_CAT_CONTROLS: "Bediening"
 STR_CAT_SYSTEM: "Systeem"
 STR_SLEEP_SCREEN: "Slaapscherm"
 STR_SLEEP_COVER_MODE: "Slaapscherm omslag-modus"
-STR_STATUS_BAR: "Statusbalk"
 STR_HIDE_BATTERY: "Batterij % verbergen"
 STR_EXTRA_SPACING: "Extra regelafstand alinea"
 STR_TEXT_AA: "Tekst Anti-Aliasing"
 STR_SHORT_PWR_BTN: "Korte klik aan/uit-knop"
 STR_ORIENTATION: "Leesstand"
-STR_FRONT_BTN_LAYOUT: "Indeling knoppen voorzijde"
 STR_SIDE_BTN_LAYOUT: "Indeling zijknoppen (lezer)"
 STR_LONG_PRESS_SKIP: "Hoofdstuk overslaan (lang indrukken)"
 STR_FONT_FAMILY: "Lettertype lezer"
-STR_EXT_READER_FONT: "Extern lettertype lezer"
-STR_EXT_CHINESE_FONT: "Lettertype lezer"
-STR_EXT_UI_FONT: "UI Lettertype"
 STR_FONT_SIZE: "Lettergrootte lezer"
 STR_LINE_SPACING: "Regelafstand lezer"
-STR_ASCII_LETTER_SPACING: "ASCII Letterafstand"
-STR_ASCII_DIGIT_SPACING: "ASCII Cijferafstand"
-STR_CJK_SPACING: "CJK Afstand"
-STR_COLOR_MODE: "Kleurmodus"
 STR_SCREEN_MARGIN: "Schermmarge lezer"
 STR_PARA_ALIGNMENT: "Uitlijning alinea lezer"
 STR_HYPHENATION: "Woordafbreking"
 STR_TIME_TO_SLEEP: "Tijd tot slaapstand"
 STR_REFRESH_FREQ: "Verversingsfrequentie"
-STR_CALIBRE_SETTINGS: "Calibre instellingen"
 STR_KOREADER_SYNC: "KOReader Sync"
 STR_CHECK_UPDATES: "Controleren op updates"
 STR_LANGUAGE: "Taal"
-STR_SELECT_WALLPAPER: "Achtergrond selecteren"
 STR_CLEAR_READING_CACHE: "Leescache wissen"
-STR_CALIBRE: "Calibre"
 STR_USERNAME: "Gebruikersnaam"
 STR_PASSWORD: "Wachtwoord"
 STR_SYNC_SERVER_URL: "Sync-server URL"
@@ -153,8 +116,6 @@ STR_COVER: "Omslag"
 STR_NONE_OPT: "Geen"
 STR_FIT: "Passend"
 STR_CROP: "Bijsnijden"
-STR_NO_PROGRESS: "Geen voortgang"
-STR_FULL_OPT: "Volledig"
 STR_NEVER: "Nooit"
 STR_IN_READER: "In lezer"
 STR_ALWAYS: "Altijd"
@@ -165,9 +126,6 @@ STR_PORTRAIT: "Staand"
 STR_LANDSCAPE_CW: "Liggend (rechtsom)"
 STR_INVERTED: "Omgekeerd"
 STR_LANDSCAPE_CCW: "Liggend (linksom)"
-STR_FRONT_LAYOUT_BCLR: "Terug, Bev., Links, Rechts"
-STR_FRONT_LAYOUT_LRBC: "Links, Rechts, Terug, Bev."
-STR_FRONT_LAYOUT_LBCR: "Links, Terug, Bev., Rechts"
 STR_PREV_NEXT: "Vorige/Volgende"
 STR_NEXT_PREV: "Volgende/Vorige"
 STR_BOOKERLY: "Bookerly"
@@ -204,8 +162,6 @@ STR_NO_UPDATE: "Geen update beschikbaar"
 STR_UPDATE_FAILED: "Update mislukt"
 STR_UPDATE_COMPLETE: "Update voltooid"
 STR_POWER_ON_HINT: "Houd de aan/uit-knop ingedrukt om in te schakelen"
-STR_EXTERNAL_FONT: "Extern lettertype"
-STR_BUILTIN_DISABLED: "Ingebouwd (Uitgeschakeld)"
 STR_NO_ENTRIES: "Geen items gevonden"
 STR_DOWNLOADING: "Downloaden..."
 STR_DOWNLOAD_FAILED: "Download mislukt"
@@ -216,7 +172,6 @@ STR_FETCH_FEED_FAILED: "Ophalen feed mislukt"
 STR_PARSE_FEED_FAILED: "Verwerken feed mislukt"
 STR_NETWORK_PREFIX: "Netwerk: "
 STR_IP_ADDRESS_PREFIX: "IP-adres: "
-STR_SCAN_QR_WIFI_HINT: "of scan de QR-code met je telefoon voor wifi-verbinding."
 STR_ERROR_GENERAL_FAILURE: "Fout: Algemene fout"
 STR_ERROR_NETWORK_NOT_FOUND: "Fout: Netwerk niet gevonden"
 STR_ERROR_CONNECTION_TIMEOUT: "Fout: Verbindingstime-out"
@@ -224,7 +179,6 @@ STR_SD_CARD: "SD-kaart"
 STR_BACK: "« Terug"
 STR_EXIT: "« Sluit"
 STR_HOME: "« Home"
-STR_SAVE: "« Opslaan"
 STR_SELECT: "Kies"
 STR_TOGGLE: "Wissel"
 STR_CONFIRM: "Bevestig"
@@ -239,16 +193,12 @@ STR_SHOW: "Toon"
 STR_HIDE: "Verberg"
 STR_STATE_ON: "AAN"
 STR_STATE_OFF: "UIT"
-STR_SET: "Stel in"
 STR_NOT_SET: "Niet ingesteld"
 STR_DIR_LEFT: "Links"
 STR_DIR_RIGHT: "Rechts"
 STR_DIR_UP: "Omhoog"
 STR_DIR_DOWN: "Omlaag"
-STR_CAPS_ON: "CAPS"
-STR_CAPS_OFF: "caps"
 STR_OK_BUTTON: "OK"
-STR_ON_MARKER: "[AAN]"
 STR_SLEEP_COVER_FILTER: "Slaapscherm omslag-filter"
 STR_FILTER_CONTRAST: "Contrast"
 STR_CUSTOMISE_STATUS_BAR: "Statusbalk aanpassen"
@@ -274,7 +224,6 @@ STR_SUNLIGHT_FADING_FIX: "Zonlicht vervaging fix"
 STR_REMAP_FRONT_BUTTONS: "Knoppen voorzijde wijzigen"
 STR_OPDS_BROWSER: "OPDS-browser"
 STR_COVER_CUSTOM: "Omslag + Aangepast"
-STR_RECENTS: "Recent"
 STR_MENU_RECENT_BOOKS: "Recente boeken"
 STR_NO_RECENT_BOOKS: "Geen recente boeken"
 STR_CALIBRE_DESC: "Gebruik Calibre draadloze overdracht"
@@ -302,9 +251,6 @@ STR_DISPLAY_QR: "Pagina als QR tonen"
 STR_CHAPTER_PREFIX: "Hoofdstuk: "
 STR_PAGES_SEPARATOR: " pagina's  |  "
 STR_BOOK_PREFIX: "Boek: "
-STR_KBD_SHIFT: "shift"
-STR_KBD_SHIFT_CAPS: "SHIFT"
-STR_KBD_LOCK: "LOCK"
 STR_CALIBRE_URL_HINT: "Voeg voor Calibre /opds toe aan de URL"
 STR_PERCENT_STEP_HINT: "Links/Rechts: 1%  Omhoog/Omlaag: 10%"
 STR_SYNCING_TIME: "Tijd synchroniseren..."