Use in-game Acceleration terminology instead of primary TWR wording

[FennexFox]

Problem

Reddit feedback shows that some players are unfamiliar with the term "TWR", while Terra Invicta presents the same practical concept to players as ship acceleration.

This is not primarily a calculation issue. The current values may be correct, but the user-facing terminology does not match the vocabulary players already know from the game UI.

When users see "TWR" as the primary term, they may not understand that it corresponds to the acceleration stat they use when designing ships in-game.

Goal

Use "Acceleration" as the primary user-facing term, while keeping "TWR" as a secondary or technical term where useful.

Scope

This issue is about terminology, labels, tooltips, help text, and localization.

It should not change the underlying calculation unless a separate calculation bug is found.

Suggested direction

Use wording like:

Acceleration
Acceleration (TWR / mg)
Minimum acceleration

Tooltips should explain the relationship in game terms:

Terra Invicta shows this as ship acceleration. Internally, this is derived from thrust divided by ship mass and may also be described as TWR.

Avoid tooltips that only expand the acronym without connecting it to the in-game stat.

Acceptance criteria

• User-facing chart labels use "Acceleration" as the primary term where appropriate.
• Filters use "Acceleration" as the primary term instead of relying on "TWR" alone.
• Tables and hover details avoid presenting "TWR" as unexplained primary terminology.
• Tooltips explain that this corresponds to Terra Invicta's ship acceleration stat.
• TWR may still appear as a secondary/technical term, especially in advanced details or formula explanations.
• Korean and English localization strings are updated consistently.
• Existing calculations remain unchanged unless a separate calculation issue is identified.

Non-goals

• Do not redesign the acceleration calculation.
• Do not remove TWR entirely from advanced or technical contexts.