feat(political-office): enhance political office benefits and salary computation

- Added a new hierarchyLevel field to PoliticalOfficeType for better categorization of political roles.
- Updated computePoliticalDailySalaryPayout function to incorporate hierarchy level in salary calculations, allowing for more dynamic salary adjustments based on office rank.
- Modified SQL scripts to reflect changes in political office benefits, ensuring compatibility with the new salary structure.
- Enhanced localization files to support updated benefit descriptions and salary formats across multiple languages.
- Improved UI components to display the new salary calculations and benefits accurately in the PoliticsView.

frontend/src/i18n/locales/en/falukant.json

@@ -576,7 +576,7 @@
             "voteAllError": "Error while submitting the votes",
             "applyError": "Application could not be submitted.",
             "benefits": {
-                "daily_salary": "Daily office stipend (once per day): about {amount}",
+                "daily_salary": "Daily office stipend (once per day): {amount}",
                 "tax_exemption": "Tax exemption: {regions}",
                 "tax_exemption_all": "Tax exemption: all regional levels",
                 "reputation_periodic": "+{gain} reputation every {days} days (office bonus)",

frontend/src/i18n/locales/en/socialnetwork.json

@@ -746,6 +746,8 @@
                 "reviewPriorityTitle": "Review is mixed in step by step",
                 "reviewPriorityIntro": "The focus starts on the new terms of this lesson. As you progress, older vocabulary is gradually mixed in.",
                 "exerciseLockTitle": "Chapter test still locked",
+                "exerciseUnlockHintTrainerCore": "The chapter test unlocks when all three conditions are met: at least {newTarget} questions on new content (see “New content”), about {attempts} trainer questions in total, and a success rate of at least {rate}%.",
+                "exerciseUnlockHintTrainerMixSuffix": "Older vocabulary is mixed in gradually.",
                 "trainerStartWithReview": "Start with the new vocabulary from this lesson. As you practice, the trainer will automatically mix in fitting review items.",
                 "startLesson": "Start lesson",
                 "trainerProgressNewContent": "New content: {current}/{target}",