Translate the remaining hard-coded interface texts (#129)

* Translate the interface texts that stage 9 left in English

The GUI tab checkboxes, the file chooser and dropdown placeholders, the
profile dialog's Apply, the settings notice's OK, the chat clear button,
the selected-station map button and "all", six column titles, the monitor
window's title and heading, and the refusal and hint texts of the profiles,
beacon and notification tab states now come from the translation files.

Column titles go through CurrentStrings in a lambda like the existing ones,
so the id stays untranslated and the stored layout keeps its keys. The tab
states read CurrentStrings as StatusIndicatorState already does. The
English values are unchanged, so the screen tests still find every control
by its old label; a new test switches to German and checks one sample per
path: a composed label, a column title and a tab-state refusal.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Translate the settings notices, profile labels and alert button too

Wires the settings.spot* and settings.write* keys that existed but were
never used, translates the settings window title and its notice titles,
the profile tab's "unknown", "Copy of" and database-mode labels, and lets
the shared alert use alert.ok instead of a literal. The German for
messages.qsoOfTheOther becomes "Fremd-QSOs", the word the menu already uses.

"Copy of" is only the suggested display name; the profile id is derived
from the entered name once at creation and stored, so a later language
switch does not touch it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

app-desktop/src/main/i18n/strings_en.properties

@@ -388,3 +388,49 @@ contrast.textOnWindowSurface=Text on the window surface
 contrast.textInsideField=Text inside a field
 contrast.accentOnWindowSurface=Accent on the window surface
 contrast.textOnMenuStrip=Text on the menu strip
+gui.startInEveningDesign=Start in the evening design
+gui.filterPublic=Public messages
+gui.filterPmToMe=Private messages to me
+gui.filterPmToOthers=Private messages to others
+gui.filterNothing=No filter
+gui.hintFreshCall=Mark a callsign seen for the first time
+gui.hintLargeGridWorked=Mark a worked large grid field
+form.choose=Choose...
+form.notSelected=not selected
+dialog.apply=Apply
+chat.clear=clear
+selected.showOnMap=🗺 Show on map
+selected.notQrvAll=all
+column.category=Category
+column.sender=Sender
+column.receiver=Receiver
+column.lastQrg=Last QRG
+column.airplane=AP [minutes / pot%]
+column.score=Score
+monitor.title=Cluster & QSO of the other
+profiles.createFailed=The profile could not be created. The profile registry could not be written.
+profiles.createdWithoutCredentials=The profile "{0}" was created without callsign and password. Enter them on the Station tab after switching to it.
+profiles.duplicateFailed=The profile could not be duplicated.
+profiles.rootNotDeletable=The default profile uses the files of the installation itself and cannot be deleted.
+profiles.activeNotDeletable=The profile currently in use cannot be deleted. Switch to another profile first.
+profiles.deleteFailed=The profile could not be deleted.
+profiles.deletionFolder=The following folder is removed permanently:\n{0}
+profiles.deletionKeepsShared=The common station worked stations are not touched.
+profiles.deletionRemovesOwn=The worked stations of this profile are deleted as well.
+profiles.rootAlwaysShared=The default profile always uses the common station worked stations, because that database is the one of the installation itself.
+profiles.changeAfterSwitch=The change takes effect after switching to this profile again.
+profiles.alreadyActive=This profile is already active.
+profiles.selectFirst=Select a profile in the table first.
+beacon.invalidMessage=The beacon message is invalid: {0}
+beacon.intervalTooShort=Enter a whole beacon interval of at least {0} minute.
+notification.invalidPort="{0}" is not a valid TCP port. Enter a value from 1 to 65535.
+notification.invalidSpotter="{0}" is not a valid spotter callsign.
+notification.invalidCallsign=Please enter a valid callsign.
+notification.alreadyMonitored=This base callsign is already in the monitoring list.
+settings.windowTitle=Change Client Settings
+settings.noticeInfo=Info
+settings.noticeProblem=Settings
+profiles.unknown=unknown
+profiles.copyOf=Copy of {0}
+profiles.sharedDatabase=common station database
+profiles.ownDatabase=own database